基于iTop-4412的U-Boot 2017移植[1]：成功运行
参考资料：
- Exynos 4412的启动过程分析
- 基于tiny4412的u-boot移植
获取U-Boot
本博客使用的版本是 U-Boot 2017.05-rc1。
$ git clone git://git.denx.de/u-boot.git
开始移植
本博客参考一款类似与iTOP-4412的开发板(采用相同的SoC)：origen 进行移植。
(一) 创建iTOP-4412板级目录
cp board/samsung/origen board/samsung/itop4412 –raf
mv board/samsung/itop4412/origen.c board/samsung/itop4412/itop4412.c
mv board/samsung/itop4412/tools/mkorigenspl.c board/samsung/itop4412/tools/mkitop4412spl.c
(二) 增加文件
cp include/configs/origen.h include/configs/itop4412.h
cp configs/origen_defconfig configs/itop4412_defconfig
cp arch/arm/dts/exynos4412-odroid.dts arch/arm/dts/exynos4412-itop4412.dts
touch arch/arm/mach-exynos/itop4412_setup.h
touch arch/arm/mach-exynos/board.c
其中board.c将对iTOP-4412的电源管理初始化，不会导致复位。
(三) 修改文件
1、修改arch/arm/dts/Makefile，用于编译设备树：
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index bc4dc2c..3be2f3a 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -14,7 +14,8 @@ dtb-$(CONFIG_EXYNOS4) += exynos4210-origen.dtb \
exynos4210-universal_c210.dtb \
exynos4210-trats.dtb \
exynos4412-trats2.dtb \
- exynos4412-odroid.dtb
+ exynos4412-odroid.dtb \
+ exynos4412-itop4412.dtb
dtb-$(CONFIG_TARGET_HIKEY) += hi6220-hikey.dtb
2、修改arch/arm/include/asm/mach-types.h，增加iTOP-4412的machine ID：
diff --git a/arch/arm/include/asm/mach-types.h b/arch/arm/include/asm/mach-types.h
index 9f82efe..e19b24b 100644
--- a/arch/arm/include/asm/mach-types.h
+++ b/arch/arm/include/asm/mach-types.h
@@ -5057,4 +5057,5 @@
#define MACH_TYPE_NASM25 5112
#define MACH_TYPE_TOMATO 5113
#define MACH_TYPE_OMAP3_MRC3D 5114
+#define MACH_TYPE_ITOP4412 5115
#endif
3、修改arch/arm/mach-exynos/Kconfig
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 46981a5..9078fc5 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -53,6 +53,10 @@ config TARGET_ORIGEN
bool "Exynos4412 Origen board"
select SUPPORT_SPL
+config TARGET_ITOP4412
+ bool "Exynos4412 iTop-4412 board"
+ select SUPPORT_SPL
+
config TARGET_TRATS2
bool "Exynos4412 Trat2 board"
@@ -149,6 +153,7 @@ source "board/samsung/smdkv310/Kconfig"
source "board/samsung/trats/Kconfig"
source "board/samsung/universal_c210/Kconfig"
source "board/samsung/origen/Kconfig"
+source "board/samsung/itop4412/Kconfig"
source "board/samsung/trats2/Kconfig"
source "board/samsung/odroid/Kconfig"
source "board/samsung/arndale/Kconfig"
4、修改 board/samsung/itop4412/Kconfig
diff --git a/board/samsung/itop4412/Kconfig b/board/samsung/itop4412/Kconfig
new file mode 100644
index 0000000..8dfef9a
--- /dev/null
+++ b/board/samsung/itop4412/Kconfig
@@ -0,0 +1,12 @@
+if TARGET_ITOP4412
+
+config SYS_BOARD
+ default "itop4412"
+
+config SYS_VENDOR
+ default "samsung"
+
+config SYS_CONFIG_NAME
+ default "itop4412"
+
+endif
5、修改board/samsung/itop4412/Makefile
diff --git a/board/samsung/itop4412/Makefile b/board/samsung/itop4412/Makefile
new file mode 100644
index 0000000..9697620
--- /dev/null
+++ b/board/samsung/itop4412/Makefile
@@ -0,0 +1,22 @@
+#
+# Copyright (C) 2011 Samsung Electronics
+#
+# SPDX-License-Identifier: GPL-2.0+
+#
+
+ifdef CONFIG_SPL_BUILD
+# necessary to create built-in.o
+obj- := __dummy__.o
+
+hostprogs-y := tools/mkitop4412spl
+always := $(hostprogs-y)
+
+# omit -O2 option to suppress
+# warning: dereferencing type-punned pointer will break strict-aliasing rules
+#
+# TODO:
+# Fix the root cause in tools/mkorigenspl.c and delete the following work-around
+$(obj)/tools/mkitop4412spl: HOSTCFLAGS:=$(filter-out -O2,$(HOSTCFLAGS))
+else
+obj-y += itop4412.o
+endif
6、修改arch/arm/dts/exynos4412-itop4412.dts，使用uart3(板子上的CON2)作为终端：
+/*
+ * Topeet iTop-4412 board device tree source
+ *
+ * Copyright (c) 2017 Ziping Chen
+ *
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/dts-v1/;
+#include "exynos4412.dtsi"
+#include
+#include
+
+/ {
+ model = "TOPEET iTop 4412 Elite board";
+ compatible = "topeet,itop4412-elite", "samsung,exynos4412", "samsung,exynos4";
+
+ chosen {
+ stdout-path = "serial3:115200n8";
+ };
+
+ aliases {
+ serial3 = "/serial@13830000";
+ console = "/serial@13830000";
+ };
+
+ leds {
+ compatible = "gpio-leds";
+
+ led2 {
+ label = "red:system";
+ gpios = <&gpl2 0 GPIO_ACTIVE_HIGH>;
+ default-state = "off";
+ linux,default-trigger = "heartbeat";
+ };
+
+ led3 {
+ label = "red:user";
+ gpios = <&gpk1 1 GPIO_ACTIVE_HIGH>;
+ default-state = "off";
+ };
+ };
+
+ gpio-keys {
+ compatible = "gpio-keys";
+
+ home {
+ label = "GPIO Key Home";
+ linux,code = ;
+ gpios = <&gpx1 1 GPIO_ACTIVE_LOW>;
+ };
+
+ back {
+ label = "GPIO Key Back";
+ linux,code = ;
+ gpios = <&gpx1 2 GPIO_ACTIVE_LOW>;
+ };
+
+ sleep {
+ label = "GPIO Key Sleep";
+ linux,code = ;
+ gpios = <&gpx3 3 GPIO_ACTIVE_LOW>;
+ };
+
+ vol-up {
+ label = "GPIO Key Vol+";
+ linux,code = ;
+ gpios = <&gpx2 1 GPIO_ACTIVE_LOW>;
+ };
+
+ vol-down {
+ label = "GPIO Key Vol-";
+ linux,code = ;
+ gpios = <&gpx2 0 GPIO_ACTIVE_LOW>;
+ };
+ };
+
+ serial3:serial@13830000 {
+ status = "okay";
+ };
+};
7、修改 arch/arm/mach-exynos/Makefile
diff --git a/arch/arm/mach-exynos/Makefile b/arch/arm/mach-exynos/Makefile
index 0cc6c32..d6e87bc 100644
--- a/arch/arm/mach-exynos/Makefile
+++ b/arch/arm/mach-exynos/Makefile
@@ -5,6 +5,7 @@
# SPDX-License-Identifier: GPL-2.0+
#
+obj-y += board.o
obj-y += soc.o
obj-$(CONFIG_CPU_V7) += clock.o pinmux.o power.o system.o
obj-$(CONFIG_ARM64) += mmu-arm64.o
@@ -14,7 +15,9 @@ obj-$(CONFIG_EXYNOS5420) += sec_boot.o
ifdef CONFIG_SPL_BUILD
obj-$(CONFIG_EXYNOS5) += clock_init_exynos5.o
obj-$(CONFIG_EXYNOS5) += dmc_common.o dmc_init_ddr3.o
-obj-$(CONFIG_EXYNOS4210)+= dmc_init_exynos4.o clock_init_exynos4.o
+ifneq (,$(filter y, $(CONFIG_EXYNOS4210) $(CONFIG_TARGET_ITOP4412)))
+obj-y += dmc_init_exynos4.o clock_init_exynos4.o
+endif
obj-y += spl_boot.o tzpc.o
obj-y += lowlevel_init.o
endif
8、修改 arch/arm/mach-exynos/clock_init_exynos4.c，时钟初始化
--- a/arch/arm/mach-exynos/clock_init_exynos4.c
+++ b/arch/arm/mach-exynos/clock_init_exynos4.c
@@ -27,15 +27,21 @@
#include
#include
#include
+#include
#include
#include
#include "common_setup.h"
+#ifdef CONFIG_TARGET_ITOP4412
+#include "itop4412_setup.h"
+#else
#include "exynos4_setup.h"
+#endif
/*
* system_clock_init: Initialize core clock and bus clock.
* void system_clock_init(void)
*/
+#ifndef CONFIG_TARGET_ITOP4412
void system_clock_init(void)
{
struct exynos4_clock *clk =
@@ -92,3 +98,374 @@ void system_clock_init(void)
sdelay(0x30000);
}
+#else
+void system_clock_init(void)
+{
+ unsigned int set, clr, clr_src_cpu, clr_pll_con0, clr_src_dmc;
+ struct exynos4x12_clock *clk = (struct exynos4x12_clock *)
+ samsung_get_base_clock();
+
+ /*
+ * CMU_CPU clocks src to MPLL
+ * Bit values: 0 ; 1
+ * MUX_APLL_SEL: FIN_PLL ; FOUT_APLL
+ * MUX_CORE_SEL: MOUT_APLL ; SCLK_MPLL
+ * MUX_HPM_SEL: MOUT_APLL ; SCLK_MPLL_USER_C
+ * MUX_MPLL_USER_SEL_C: FIN_PLL ; SCLK_MPLL
+ */
+ clr_src_cpu = MUX_APLL_SEL(1) | MUX_CORE_SEL(1) |
+ MUX_HPM_SEL(1) | MUX_MPLL_USER_SEL_C(1);
+ set = MUX_APLL_SEL(0) | MUX_CORE_SEL(1) | MUX_HPM_SEL(1) |
+ MUX_MPLL_USER_SEL_C(1);
+
+ clrsetbits_le32(&clk->src_cpu, clr_src_cpu, set);
+
+ /* Wait for mux change */
+ while (readl(&clk->mux_stat_cpu) & MUX_STAT_CPU_CHANGING)
+ continue;
+
+ /* Set APLL to 1400MHz */
+ clr_pll_con0 = SDIV(7) | PDIV(63) | MDIV(1023) | FSEL(1);
+ set = SDIV(0x0) | PDIV(0x3) | MDIV(0xAF) | FSEL(1);
+
+ clrsetbits_le32(&clk->apll_con0, clr_pll_con0, set);
+
+ /* Wait for PLL to be locked */
+ while (!(readl(&clk->apll_con0) & PLL_LOCKED_BIT))
+ continue;
+
+ /* Set CMU_CPU clocks src to APLL */
+ set = MUX_APLL_SEL(1) | MUX_CORE_SEL(0) | MUX_HPM_SEL(0) |
+ MUX_MPLL_USER_SEL_C(1);
+ clrsetbits_le32(&clk->src_cpu, clr_src_cpu, set);
+
+ /* Wait for mux change */
+ while (readl(&clk->mux_stat_cpu) & MUX_STAT_CPU_CHANGING)
+ continue;
+
+ set = CORE_RATIO(0) | COREM0_RATIO(2) | COREM1_RATIO(5) |
+ PERIPH_RATIO(0) | ATB_RATIO(4) | PCLK_DBG_RATIO(1) |
+ APLL_RATIO(0) | CORE2_RATIO(0);
+ /*
+ * Set dividers for MOUTcore = 1400 MHz
+ * coreout = MOUT / (ratio 1) = 1400 MHz (0)
+ * corem0 = armclk / (ratio 1) = 466 MHz (2)
+ * corem1 = armclk / (ratio 1) = 233 MHz (5)
+ * periph = armclk / (ratio 1) = 1400 MHz (0)
+ * atbout = MOUT / (ratio 1) = 280 MHz (4)
+ * pclkdbgout = atbout / (ratio 1) = 140 MHz (1)
+ * sclkapll = MOUTapll / (ratio 1) = 1400 MHz (0)
+ * core2out = core_out / (ratio 1) = 1400 MHz (0) (armclk)
+ */
+ clr = CORE_RATIO(7) | COREM0_RATIO(7) | COREM1_RATIO(7) |
+ PERIPH_RATIO(7) | ATB_RATIO(7) | PCLK_DBG_RATIO(7) |
+ APLL_RATIO(7) | CORE2_RATIO(7);
+
+ clrsetbits_le32(&clk->div_cpu0, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_cpu0) & DIV_STAT_CPU0_CHANGING)
+ continue;
+
+ /*
+ * For MOUThpm = 1400 MHz (MOUTapll)
+ * doutcopy = MOUThpm / (ratio 1) = 280 (4)
+ * sclkhpm = doutcopy / (ratio 1) = 280 (4)
+ * cores_out = armclk / (ratio 1) = 280 (4)
+ */
+ clr = COPY_RATIO(7) | HPM_RATIO(7) | CORES_RATIO(7);
+ set = COPY_RATIO(4) | HPM_RATIO(4) | CORES_RATIO(4);
+
+ clrsetbits_le32(&clk->div_cpu1, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_cpu1) & DIV_STAT_CPU1_CHANGING)
+ continue;
+
+ /*
+ * Set CMU_DMC clocks src to APLL
+ * Bit values: 0 ; 1
+ * MUX_C2C_SEL: SCLKMPLL ; SCLKAPLL
+ * MUX_DMC_BUS_SEL: SCLKMPLL ; SCLKAPLL
+ * MUX_DPHY_SEL: SCLKMPLL ; SCLKAPLL
+ * MUX_MPLL_SEL: FINPLL ; MOUT_MPLL_FOUT
+ * MUX_PWI_SEL: 0110 (MPLL); 0111 (EPLL); 1000 (VPLL); 0(XXTI)
+ * MUX_G2D_ACP0_SEL: SCLKMPLL ; SCLKAPLL
+ * MUX_G2D_ACP1_SEL: SCLKEPLL ; SCLKVPLL
+ * MUX_G2D_ACP_SEL: OUT_ACP0 ; OUT_ACP1
+ */
+ clr_src_dmc = MUX_C2C_SEL(1) | MUX_DMC_BUS_SEL(1) |
+ MUX_DPHY_SEL(1) | MUX_MPLL_SEL(1) |
+ MUX_PWI_SEL(15) | MUX_G2D_ACP0_SEL(1) |
+ MUX_G2D_ACP1_SEL(1) | MUX_G2D_ACP_SEL(1);
+ set = MUX_C2C_SEL(1) | MUX_DMC_BUS_SEL(1) | MUX_DPHY_SEL(1) |
+ MUX_MPLL_SEL(0) | MUX_PWI_SEL(0) | MUX_G2D_ACP0_SEL(1) |
+ MUX_G2D_ACP1_SEL(1) | MUX_G2D_ACP_SEL(1);
+
+ clrsetbits_le32(&clk->src_dmc, clr_src_dmc, set);
+
+ /* Wait for mux change */
+ while (readl(&clk->mux_stat_dmc) & MUX_STAT_DMC_CHANGING)
+ continue;
+
+ /* Set MPLL to 800MHz */
+ set = SDIV(0) | PDIV(3) | MDIV(100) | FSEL(0) | PLL_ENABLE(1);
+
+ clrsetbits_le32(&clk->mpll_con0, clr_pll_con0, set);
+
+ /* Wait for PLL to be locked */
+ while (!(readl(&clk->mpll_con0) & PLL_LOCKED_BIT))
+ continue;
+
+ /* Switch back CMU_DMC mux */
+ set = MUX_C2C_SEL(0) | MUX_DMC_BUS_SEL(0) | MUX_DPHY_SEL(0) |
+ MUX_MPLL_SEL(1) | MUX_PWI_SEL(6) | MUX_G2D_ACP0_SEL(0) |
+ MUX_G2D_ACP1_SEL(0) | MUX_G2D_ACP_SEL(0);
+
+ clrsetbits_le32(&clk->src_dmc, clr_src_dmc, set);
+
+ /* Wait for mux change */
+ while (readl(&clk->mux_stat_dmc) & MUX_STAT_DMC_CHANGING)
+ continue;
+
+ /* CLK_DIV_DMC0 */
+ clr = ACP_RATIO(7) | ACP_PCLK_RATIO(7) | DPHY_RATIO(7) |
+ DMC_RATIO(7) | DMCD_RATIO(7) | DMCP_RATIO(7);
+ /*
+ * For:
+ * MOUTdmc = 800 MHz
+ * MOUTdphy = 800 MHz
+ *
+ * aclk_acp = MOUTdmc / (ratio 1) = 200 (3)
+ * pclk_acp = aclk_acp / (ratio 1) = 100 (1)
+ * sclk_dphy = MOUTdphy / (ratio 1) = 400 (1)
+ * sclk_dmc = MOUTdmc / (ratio 1) = 400 (1)
+ * aclk_dmcd = sclk_dmc / (ratio 1) = 200 (1)
+ * aclk_dmcp = aclk_dmcd / (ratio 1) = 100 (1)
+ */
+ set = ACP_RATIO(3) | ACP_PCLK_RATIO(1) | DPHY_RATIO(1) |
+ DMC_RATIO(1) | DMCD_RATIO(1) | DMCP_RATIO(1);
+
+ clrsetbits_le32(&clk->div_dmc0, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_dmc0) & DIV_STAT_DMC0_CHANGING)
+ continue;
+
+ /* CLK_DIV_DMC1 */
+ clr = G2D_ACP_RATIO(15) | C2C_RATIO(7) | PWI_RATIO(15) |
+ C2C_ACLK_RATIO(7) | DVSEM_RATIO(127) | DPM_RATIO(127);
+ /*
+ * For:
+ * MOUTg2d = 800 MHz
+ * MOUTc2c = 800 Mhz
+ * MOUTpwi = 800 MHz
+ *
+ * sclk_g2d_acp = MOUTg2d / (ratio 1) = 200 (3)
+ * sclk_c2c = MOUTc2c / (ratio 1) = 400 (1)
+ * aclk_c2c = sclk_c2c / (ratio 1) = 200 (1)
+ * sclk_pwi = MOUTpwi / (ratio 1) = 100 (7)
+ */
+ set = G2D_ACP_RATIO(3) | C2C_RATIO(1) | PWI_RATIO(7) |
+ C2C_ACLK_RATIO(1) | DVSEM_RATIO(1) | DPM_RATIO(1);
+
+ clrsetbits_le32(&clk->div_dmc1, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_dmc1) & DIV_STAT_DMC1_CHANGING)
+ continue;
+
+ /* CLK_SRC_PERIL0 */
+ clr = UART0_SEL(15) | UART1_SEL(15) | UART2_SEL(15) |
+ UART3_SEL(15) | UART4_SEL(15);
+ /*
+ * Set CLK_SRC_PERIL0 clocks src to MPLL
+ * src values: 0(XXTI); 1(XusbXTI); 2(SCLK_HDMI24M); 3(SCLK_USBPHY0);
+ * 5(SCLK_HDMIPHY); 6(SCLK_MPLL_USER_T); 7(SCLK_EPLL);
+ * 8(SCLK_VPLL)
+ *
+ * Set all to SCLK_MPLL_USER_T
+ */
+ set = UART0_SEL(6) | UART1_SEL(6) | UART2_SEL(6) | UART3_SEL(6) |
+ UART4_SEL(6);
+
+ clrsetbits_le32(&clk->src_peril0, clr, set);
+
+ /* CLK_DIV_PERIL0 */
+ clr = UART0_RATIO(15) | UART1_RATIO(15) | UART2_RATIO(15) |
+ UART3_RATIO(15) | UART4_RATIO(15);
+ /*
+ * For MOUTuart0-4: 800MHz
+ *
+ * SCLK_UARTx = MOUTuartX / (ratio 1) = 100 (7)
+ */
+ set = UART0_RATIO(7) | UART1_RATIO(7) | UART2_RATIO(7) |
+ UART3_RATIO(7) | UART4_RATIO(7);
+
+ clrsetbits_le32(&clk->div_peril0, clr, set);
+
+ while (readl(&clk->div_stat_peril0) & DIV_STAT_PERIL0_CHANGING)
+ continue;
+
+ /* CLK_DIV_FSYS1 */
+ clr = MMC0_RATIO(15) | MMC0_PRE_RATIO(255) | MMC1_RATIO(15) |
+ MMC1_PRE_RATIO(255);
+ /*
+ * For MOUTmmc0-3 = 800 MHz (MPLL)
+ *
+ * DOUTmmc1 = MOUTmmc1 / (ratio 1) = 100 (7)
+ * sclk_mmc1 = DOUTmmc1 / (ratio 1) = 50 (1)
+ * DOUTmmc0 = MOUTmmc0 / (ratio 1) = 100 (7)
+ * sclk_mmc0 = DOUTmmc0 / (ratio 1) = 50 (1)
+ */
+ set = MMC0_RATIO(7) | MMC0_PRE_RATIO(1) | MMC1_RATIO(7) |
+ MMC1_PRE_RATIO(1);
+
+ clrsetbits_le32(&clk->div_fsys1, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_fsys1) & DIV_STAT_FSYS1_CHANGING)
+ continue;
+
+ /* CLK_DIV_FSYS2 */
+ clr = MMC2_RATIO(15) | MMC2_PRE_RATIO(255) | MMC3_RATIO(15) |
+ MMC3_PRE_RATIO(255);
+ /*
+ * For MOUTmmc0-3 = 800 MHz (MPLL)
+ *
+ * DOUTmmc3 = MOUTmmc3 / (ratio 1) = 100 (7)
+ * sclk_mmc3 = DOUTmmc3 / (ratio 1) = 50 (1)
+ * DOUTmmc2 = MOUTmmc2 / (ratio 1) = 100 (7)
+ * sclk_mmc2 = DOUTmmc2 / (ratio 1) = 50 (1)
+ */
+ set = MMC2_RATIO(7) | MMC2_PRE_RATIO(4) | MMC3_RATIO(7) |
+ MMC3_PRE_RATIO(1);
+
+ clrsetbits_le32(&clk->div_fsys2, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_fsys2) & DIV_STAT_FSYS2_CHANGING)
+ continue;
+
+ /* CLK_DIV_FSYS3 */
+ clr = MMC4_RATIO(15) | MMC4_PRE_RATIO(255);
+ /*
+ * For MOUTmmc4 = 800 MHz (MPLL)
+ *
+ * DOUTmmc4 = MOUTmmc4 / (ratio 1) = 100 (7)
+ * sclk_mmc4 = DOUTmmc4 / (ratio 1) = 100 (0)
+ */
+ set = MMC4_RATIO(7) | MMC4_PRE_RATIO(0);
+
+ clrsetbits_le32(&clk->div_fsys3, clr, set);
+
+ /* Wait for divider ready status */
+ while (readl(&clk->div_stat_fsys3) & DIV_STAT_FSYS3_CHANGING)
+ continue;
+}
+#endif
9、编辑文件itop4412_setup.h：
--- /dev/null
+++ b/arch/arm/mach-exynos/itop4412_setup.h
@@ -0,0 +1,227 @@
+/*
+ * Copyright (C) 2014 Samsung Electronics
+ * Przemyslaw Marczak
+ *
+ * SPDX-License-Identifier: GPL-2.0
+ */
+
+#ifndef __ITOP4412_SETUP__
+#define __ITOP4412_SETUP__
+
+/* A/M PLL_CON0 */
+#define SDIV(x) ((x) & 0x7)
+#define PDIV(x) (((x) & 0x3f) << 8)
+#define MDIV(x) (((x) & 0x3ff) << 16)
+#define FSEL(x) (((x) & 0x1) << 27)
+#define PLL_LOCKED_BIT (0x1 << 29)
+#define PLL_ENABLE(x) (((x) & 0x1) << 31)
+
+/* CLK_SRC_CPU */
+#define MUX_APLL_SEL(x) ((x) & 0x1)
+#define MUX_CORE_SEL(x) (((x) & 0x1) << 16)
+#define MUX_HPM_SEL(x) (((x) & 0x1) << 20)
+#define MUX_MPLL_USER_SEL_C(x) (((x) & 0x1) << 24)
+
+#define MUX_STAT_CHANGING 0x100
+
+/* CLK_MUX_STAT_CPU */
+#define APLL_SEL(x) ((x) & 0x7)
+#define CORE_SEL(x) (((x) & 0x7) << 16)
+#define HPM_SEL(x) (((x) & 0x7) << 20)
+#define MPLL_USER_SEL_C(x) (((x) & 0x7) << 24)
+#define MUX_STAT_CPU_CHANGING (APLL_SEL(MUX_STAT_CHANGING) | \
+ CORE_SEL(MUX_STAT_CHANGING) | \
+ HPM_SEL(MUX_STAT_CHANGING) | \
+ MPLL_USER_SEL_C(MUX_STAT_CHANGING))
+
+/* CLK_DIV_CPU0 */
+#define CORE_RATIO(x) ((x) & 0x7)
+#define COREM0_RATIO(x) (((x) & 0x7) << 4)
+#define COREM1_RATIO(x) (((x) & 0x7) << 8)
+#define PERIPH_RATIO(x) (((x) & 0x7) << 12)
+#define ATB_RATIO(x) (((x) & 0x7) << 16)
+#define PCLK_DBG_RATIO(x) (((x) & 0x7) << 20)
+#define APLL_RATIO(x) (((x) & 0x7) << 24)
+#define CORE2_RATIO(x) (((x) & 0x7) << 28)
+
+/* CLK_DIV_STAT_CPU0 */
+#define DIV_CORE(x) ((x) & 0x1)
+#define DIV_COREM0(x) (((x) & 0x1) << 4)
+#define DIV_COREM1(x) (((x) & 0x1) << 8)
+#define DIV_PERIPH(x) (((x) & 0x1) << 12)
+#define DIV_ATB(x) (((x) & 0x1) << 16)
+#define DIV_PCLK_DBG(x) (((x) & 0x1) << 20)
+#define DIV_APLL(x) (((x) & 0x1) << 24)
+#define DIV_CORE2(x) (((x) & 0x1) << 28)
+
+#define DIV_STAT_CHANGING 0x1
+#define DIV_STAT_CPU0_CHANGING (DIV_CORE(DIV_STAT_CHANGING) | \
+ DIV_COREM0(DIV_STAT_CHANGING) | \
+ DIV_COREM1(DIV_STAT_CHANGING) | \
+ DIV_PERIPH(DIV_STAT_CHANGING) | \
+ DIV_ATB(DIV_STAT_CHANGING) | \
+ DIV_PCLK_DBG(DIV_STAT_CHANGING) | \
+ DIV_APLL(DIV_STAT_CHANGING) | \
+ DIV_CORE2(DIV_STAT_CHANGING))
+
+/* CLK_DIV_CPU1 */
+#define COPY_RATIO(x) ((x) & 0x7)
+#define HPM_RATIO(x) (((x) & 0x7) << 4)
+#define CORES_RATIO(x) (((x) & 0x7) << 8)
+
+/* CLK_DIV_STAT_CPU1 */
+#define DIV_COPY(x) ((x) & 0x7)
+#define DIV_HPM(x) (((x) & 0x1) << 4)
+#define DIV_CORES(x) (((x) & 0x1) << 8)
+
+#define DIV_STAT_CPU1_CHANGING (DIV_COPY(DIV_STAT_CHANGING) | \
+ DIV_HPM(DIV_STAT_CHANGING) | \
+ DIV_CORES(DIV_STAT_CHANGING))
+
+/* CLK_SRC_DMC */
+#define MUX_C2C_SEL(x) ((x) & 0x1)
+#define MUX_DMC_BUS_SEL(x) (((x) & 0x1) << 4)
+#define MUX_DPHY_SEL(x) (((x) & 0x1) << 8)
+#define MUX_MPLL_SEL(x) (((x) & 0x1) << 12)
+#define MUX_PWI_SEL(x) (((x) & 0xf) << 16)
+#define MUX_G2D_ACP0_SEL(x) (((x) & 0x1) << 20)
+#define MUX_G2D_ACP1_SEL(x) (((x) & 0x1) << 24)
+#define MUX_G2D_ACP_SEL(x) (((x) & 0x1) << 28)
+
+/* CLK_MUX_STAT_DMC */
+#define C2C_SEL(x) (((x)) & 0x7)
+#define DMC_BUS_SEL(x) (((x) & 0x7) << 4)
+#define DPHY_SEL(x) (((x) & 0x7) << 8)
+#define MPLL_SEL(x) (((x) & 0x7) << 12)
+/* #define PWI_SEL(x) (((x) & 0xf) << 16) - Reserved */
+#define G2D_ACP0_SEL(x) (((x) & 0x7) << 20)
+#define G2D_ACP1_SEL(x) (((x) & 0x7) << 24)
+#define G2D_ACP_SEL(x) (((x) & 0x7) << 28)
+
+#define MUX_STAT_DMC_CHANGING (C2C_SEL(MUX_STAT_CHANGING) | \
+ DMC_BUS_SEL(MUX_STAT_CHANGING) | \
+ DPHY_SEL(MUX_STAT_CHANGING) | \
+ MPLL_SEL(MUX_STAT_CHANGING) |\
+ G2D_ACP0_SEL(MUX_STAT_CHANGING) | \
+ G2D_ACP1_SEL(MUX_STAT_CHANGING) | \
+ G2D_ACP_SEL(MUX_STAT_CHANGING))
+
+/* CLK_DIV_DMC0 */
+#define ACP_RATIO(x) ((x) & 0x7)
+#define ACP_PCLK_RATIO(x) (((x) & 0x7) << 4)
+#define DPHY_RATIO(x) (((x) & 0x7) << 8)
+#define DMC_RATIO(x) (((x) & 0x7) << 12)
+#define DMCD_RATIO(x) (((x) & 0x7) << 16)
+#define DMCP_RATIO(x) (((x) & 0x7) << 20)
+
+/* CLK_DIV_STAT_DMC0 */
+#define DIV_ACP(x) ((x) & 0x1)
+#define DIV_ACP_PCLK(x) (((x) & 0x1) << 4)
+#define DIV_DPHY(x) (((x) & 0x1) << 8)
+#define DIV_DMC(x) (((x) & 0x1) << 12)
+#define DIV_DMCD(x) (((x) & 0x1) << 16)
+#define DIV_DMCP(x) (((x) & 0x1) << 20)
+
+#define DIV_STAT_DMC0_CHANGING (DIV_ACP(DIV_STAT_CHANGING) | \
+ DIV_ACP_PCLK(DIV_STAT_CHANGING) | \
+ DIV_DPHY(DIV_STAT_CHANGING) | \
+ DIV_DMC(DIV_STAT_CHANGING) | \
+ DIV_DMCD(DIV_STAT_CHANGING) | \
+ DIV_DMCP(DIV_STAT_CHANGING))
+
+/* CLK_DIV_DMC1 */
+#define G2D_ACP_RATIO(x) ((x) & 0xf)
+#define C2C_RATIO(x) (((x) & 0x7) << 4)
+#define PWI_RATIO(x) (((x) & 0xf) << 8)
+#define C2C_ACLK_RATIO(x) (((x) & 0x7) << 12)
+#define DVSEM_RATIO(x) (((x) & 0x7f) << 16)
+#define DPM_RATIO(x) (((x) & 0x7f) << 24)
+
+/* CLK_DIV_STAT_DMC1 */
+#define DIV_G2D_ACP(x) ((x) & 0x1)
+#define DIV_C2C(x) (((x) & 0x1) << 4)
+#define DIV_PWI(x) (((x) & 0x1) << 8)
+#define DIV_C2C_ACLK(x) (((x) & 0x1) << 12)
+#define DIV_DVSEM(x) (((x) & 0x1) << 16)
+#define DIV_DPM(x) (((x) & 0x1) << 24)
+
+#define DIV_STAT_DMC1_CHANGING (DIV_G2D_ACP(DIV_STAT_CHANGING) | \
+ DIV_C2C(DIV_STAT_CHANGING) | \
+ DIV_PWI(DIV_STAT_CHANGING) | \
+ DIV_C2C_ACLK(DIV_STAT_CHANGING) | \
+ DIV_DVSEM(DIV_STAT_CHANGING) | \
+ DIV_DPM(DIV_STAT_CHANGING))
+
+/* Set CLK_SRC_PERIL0 */
+#define UART4_SEL(x) (((x) & 0xf) << 16)
+#define UART3_SEL(x) (((x) & 0xf) << 12)
+#define UART2_SEL(x) (((x) & 0xf) << 8)
+#define UART1_SEL(x) (((x) & 0xf) << 4)
+#define UART0_SEL(x) ((x) & 0xf)
+
+/* Set CLK_DIV_PERIL0 */
+#define UART4_RATIO(x) (((x) & 0xf) << 16)
+#define UART3_RATIO(x) (((x) & 0xf) << 12)
+#define UART2_RATIO(x) (((x) & 0xf) << 8)
+#define UART1_RATIO(x) (((x) & 0xf) << 4)
+#define UART0_RATIO(x) ((x) & 0xf)
+
+/* Set CLK_DIV_STAT_PERIL0 */
+#define DIV_UART4(x) (((x) & 0x1) << 16)
+#define DIV_UART3(x) (((x) & 0x1) << 12)
+#define DIV_UART2(x) (((x) & 0x1) << 8)
+#define DIV_UART1(x) (((x) & 0x1) << 4)
+#define DIV_UART0(x) ((x) & 0x1)
+
+#define DIV_STAT_PERIL0_CHANGING (DIV_UART4(DIV_STAT_CHANGING) | \
+ DIV_UART3(DIV_STAT_CHANGING) | \
+ DIV_UART2(DIV_STAT_CHANGING) | \
+ DIV_UART1(DIV_STAT_CHANGING) | \
+ DIV_UART0(DIV_STAT_CHANGING))
+
+/* CLK_DIV_FSYS1 */
+#define MMC0_RATIO(x) ((x) & 0xf)
+#define MMC0_PRE_RATIO(x) (((x) & 0xff) << 8)
+#define MMC1_RATIO(x) (((x) & 0xf) << 16)
+#define MMC1_PRE_RATIO(x) (((x) & 0xff) << 24)
+
+/* CLK_DIV_STAT_FSYS1 */
+#define DIV_MMC0(x) ((x) & 1)
+#define DIV_MMC0_PRE(x) (((x) & 1) << 8)
+#define DIV_MMC1(x) (((x) & 1) << 16)
+#define DIV_MMC1_PRE(x) (((x) & 1) << 24)
+
+#define DIV_STAT_FSYS1_CHANGING (DIV_MMC0(DIV_STAT_CHANGING) | \
+ DIV_MMC0_PRE(DIV_STAT_CHANGING) | \
+ DIV_MMC1(DIV_STAT_CHANGING) | \
+ DIV_MMC1_PRE(DIV_STAT_CHANGING))
+
+/* CLK_DIV_FSYS2 */
+#define MMC2_RATIO(x) ((x) & 0xf)
+#define MMC2_PRE_RATIO(x) (((x) & 0xff) << 8)
+#define MMC3_RATIO(x) (((x) & 0xf) << 16)
+#define MMC3_PRE_RATIO(x) (((x) & 0xff) << 24)
+
+/* CLK_DIV_STAT_FSYS2 */
+#define DIV_MMC2(x) ((x) & 0x1)
+#define DIV_MMC2_PRE(x) (((x) & 0x1) << 8)
+#define DIV_MMC3(x) (((x) & 0x1) << 16)
+#define DIV_MMC3_PRE(x) (((x) & 0x1) << 24)
+
+#define DIV_STAT_FSYS2_CHANGING (DIV_MMC2(DIV_STAT_CHANGING) | \
+ DIV_MMC2_PRE(DIV_STAT_CHANGING) | \
+ DIV_MMC3(DIV_STAT_CHANGING) | \
+ DIV_MMC3_PRE(DIV_STAT_CHANGING))
+
+/* CLK_DIV_FSYS3 */
+#define MMC4_RATIO(x) ((x) & 0x7)
+#define MMC4_PRE_RATIO(x) (((x) & 0xff) << 8)
+
+/* CLK_DIV_STAT_FSYS3 */
+#define DIV_MMC4(x) ((x) & 0x1)
+#define DIV_MMC4_PRE(x) (((x) & 0x1) << 8)
+
+#define DIV_STAT_FSYS3_CHANGING (DIV_MMC4(DIV_STAT_CHANGING) | \
+ DIV_MMC4_PRE(DIV_STAT_CHANGING))
+
+#endif /*__ITOP4412_SETUP__ */
10、修改arch/arm/mach-exynos/dmc_init_exynos4.c，内存控制器初始化 ：
--- a/arch/arm/mach-exynos/dmc_init_exynos4.c
+++ b/arch/arm/mach-exynos/dmc_init_exynos4.c
@@ -28,6 +28,28 @@
#include "common_setup.h"
#include "exynos4_setup.h"
+#ifdef CONFIG_TARGET_ITOP4412
+struct mem_timings mem = {
+ .direct_cmd_msr = {
+ DIRECT_CMD1, DIRECT_CMD2, DIRECT_CMD3, DIRECT_CMD4
+ },
+ .timingref = 0x000000BB,
+ .timingrow = 0x7846654F,
+ .timingdata = 0x46400506,
+ .timingpower = 0x52000A3C,
+ .zqcontrol = 0xE3855503,
+ .control0 = 0x71101008,
+ .control1 = 0x20000086,
+ .control2 = 0x00000000,
+ .concontrol = 0x0FFF30CA,
+ .prechconfig = 0x64000000,
+ .memcontrol = 0x00302600,
+ .memconfig0 = 0x40801333,
+ .memconfig1 = 0x60801333,
+ .dll_resync = FORCE_DLL_RESYNC,
+ .dll_on = DLL_CONTROL_ON,
+};
+#else
struct mem_timings mem = {
.direct_cmd_msr = {
DIRECT_CMD1, DIRECT_CMD2, DIRECT_CMD3, DIRECT_CMD4
@@ -48,6 +70,7 @@ struct mem_timings mem = {
.dll_resync = FORCE_DLL_RESYNC,
.dll_on = DLL_CONTROL_ON,
};
+#endif
static void phy_control_reset(int ctrl_no, struct exynos4_dmc *dmc)
{
if (ctrl_no) {
@@ -124,6 +147,10 @@ static void dmc_init(struct exynos4_dmc *dmc)
writel(mem.memconfig0, &dmc->memconfig0);
writel(mem.memconfig1, &dmc->memconfig1);
+#ifdef CONFIG_TARGET_ITOP4412
+ writel(0x8000001F, &dmc->ivcontrol);
+#endif
+
/* Config Precharge Policy */
writel(mem.prechconfig, &dmc->prechconfig);
/*
@@ -165,6 +192,7 @@ static void dmc_init(struct exynos4_dmc *dmc)
writel((mem.concontrol | AREF_EN), &dmc->concontrol);
}
+#if 1
void mem_ctrl_init(int reset)
{
struct exynos4_dmc *dmc;
@@ -175,6 +203,7 @@ void mem_ctrl_init(int reset)
* 0: full_sync
*/
writel(1, ASYNC_CONFIG);
+#ifndef CONFIG_TARGET_ITOP4412
#ifdef CONFIG_ORIGEN
/* Interleave: 2Bit, Interleave_bit1: 0x15, Interleave_bit0: 0x7 */
writel(APB_SFR_INTERLEAVE_CONF_VAL, EXYNOS4_MIU_BASE +
@@ -204,6 +233,7 @@ void mem_ctrl_init(int reset)
ABP_SFR_SLV_ADDRMAP_CONF_OFFSET);
#endif
#endif
+#endif
/* DREX0 */
dmc = (struct exynos4_dmc *)samsung_get_base_dmc_ctrl();
dmc_init(dmc);
@@ -211,3 +241,154 @@ void mem_ctrl_init(int reset)
+ DMC_OFFSET);
dmc_init(dmc);
}
+#endif
11、修改arch/arm/mach-exynos/spl_boot.c支持copy_uboot_to_ram：
--- a/arch/arm/mach-exynos/spl_boot.c
+++ b/arch/arm/mach-exynos/spl_boot.c
@@ -15,11 +15,17 @@
#include
#include
#include
+#include
#include "common_setup.h"
#include "clock_init.h"
DECLARE_GLOBAL_DATA_PTR;
+/*
+ * WARNING: This is going away very soon. Don't use it and don't submit
+ * pafches that rely on it. The global_data area is set up in crt0.S.
+ */
+gd_t gdata __attribute__ ((section(".data")));
/* Index into irom ptr table */
enum index {
@@ -185,6 +191,8 @@ void copy_uboot_to_ram(void)
{
unsigned int bootmode = BOOT_MODE_OM;
u32 (*copy_bl2)(u32 offset, u32 nblock, u32 dst) = NULL;
u32 offset = 0, size = 0;
#ifdef CONFIG_SPI_BOOTING
@@ -254,8 +262,38 @@ void copy_uboot_to_ram(void)
break;
}
- if (copy_bl2)
+#ifdef CONFIG_TARGET_ITOP4412
+ if (copy_bl2) {
+ /*
+ * Here I use iram 0x020250000-0x020260000 (64k)
+ * as an buffer, and copy u-boot from sd card to
+ * this buffer, then copy it to dram started
+ * from 0x43e00000.
+ *
+ */
+ unsigned int i, count = 0;
+ unsigned char *buffer = (unsigned char *)0x02050000;
+ unsigned char *dst = (unsigned char *)CONFIG_SYS_TEXT_BASE;
+ unsigned int step = (0x10000 / 512);
+
+ for (count = 0; count < BL2_SIZE_BLOC_COUNT; count += step) {
+ /* copy u-boot from sdcard to iram firstly. */
+ copy_bl2((u32)(BL2_START_OFFSET+count), (u32)step, (u32)buffer);
+ /* then copy u-boot from iram to dram. */
+ for (i = 0; i < 0x10000; i++) {
+ *dst++ = buffer[i];
+ }
+ }
+ }
+#else
+ if (copy_bl2) {
copy_bl2(offset, size, CONFIG_SYS_TEXT_BASE);
+ }
+#endif
}
void memzero(void *s, size_t n)
@@ -282,7 +320,7 @@ static void setup_global_data(gd_t *gdp)
gd->baudrate = CONFIG_BAUDRATE;
gd->have_console = 1;
}
-
+#include
void board_init_f(unsigned long bootflag)
{
__aligned(8) gd_t local_gd;
@@ -293,10 +331,14 @@ void board_init_f(unsigned long bootflag)
if (do_lowlevel_init())
power_exit_wakeup();
+ printascii("\r\nU-Boot SPL " PLAIN_VERSION " (" U_BOOT_DATE " - " \
+ U_BOOT_TIME ")\r\n");
+
copy_uboot_to_ram();
/* Jump to U-Boot image */
uboot = (void *)CONFIG_SYS_TEXT_BASE;
(*uboot)();
/* Never returns Here */
}
12、修改configs/itop4412_defconfig
--- /dev/null
+++ b/configs/itop4412_defconfig
@@ -0,0 +1,40 @@
+CONFIG_ARM=y
+CONFIG_ARCH_EXYNOS=y
+CONFIG_ARCH_EXYNOS4=y
+CONFIG_TARGET_ITOP4412=y
+CONFIG_IDENT_STRING=" Samsung Electronic"
+CONFIG_DEFAULT_DEVICE_TREE="exynos4412-itop4412"
+CONFIG_SYS_PROMPT="iTOP-4412 # "
+CONFIG_SPL=y
+CONFIG_HUSH_PARSER=y
+# CONFIG_CMD_IMLS is not set
+# CONFIG_CMD_XIMG is not set
+CONFIG_CMD_GPT=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_PART=y
+CONFIG_CMD_DFU=y
+CONFIG_CMD_USB_MASS_STORAGE=y
+# CONFIG_CMD_FPGA is not set
+# CONFIG_CMD_NET is not set
+# CONFIG_CMD_NFS is not set
+CONFIG_CMD_MII=y
+CONFIG_CMD_CACHE=y
+# CONFIG_CMD_MISC is not set
+CONFIG_CMD_EXT4=y
+CONFIG_CMD_EXT4_WRITE=y
+CONFIG_CMD_FAT=y
+CONFIG_ISO_PARTITION=y
+CONFIG_OF_CONTROL=y
+CONFIG_DFU_MMC=y
+CONFIG_MMC_DW=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_SDMA=y
+CONFIG_MMC_SDHCI_S5P=y
+CONFIG_USB=y
+CONFIG_DM_USB=y
+CONFIG_USB_GADGET=y
+CONFIG_USB_GADGET_DWC2_OTG=y
+CONFIG_USB_GADGET_DOWNLOAD=y
+CONFIG_G_DNL_MANUFACTURER="Samsung"
+CONFIG_G_DNL_VENDOR_NUM=0x04e8
+CONFIG_G_DNL_PRODUCT_NUM=0x6601
13、修改drivers/serial/serial_s5p.c，配置串口的波特率、格式等信息：
diff --git a/drivers/serial/serial_s5p.c b/drivers/serial/serial_s5p.c
index 96842de..5174150 100644
--- a/drivers/serial/serial_s5p.c
+++ b/drivers/serial/serial_s5p.c
@@ -63,12 +63,20 @@ static const int udivslot[] = {
static void __maybe_unused s5p_serial_init(struct s5p_uart *uart)
{
/* enable FIFOs, auto clear Rx FIFO */
+#ifdef CONFIG_ITOP4412
+ writel(0x111, &uart->ufcon);
+#else
writel(0x3, &uart->ufcon);
+#endif
writel(0, &uart->umcon);
/* 8N1 */
writel(0x3, &uart->ulcon);
/* No interrupts, no DMA, pure polling */
+#ifdef CONFIG_ITOP4412
+ writel(0x3c5, &uart->ucon);
+#else
writel(0x245, &uart->ucon);
+#endif
}
14、修改include/configs/itop4412.h
diff --git a/include/configs/itop4412.h b/include/configs/itop4412.h
new file mode 100644
index 0000000..fe7cac2
--- /dev/null
+++ b/include/configs/itop4412.h
@@ -0,0 +1,137 @@
+/*
+ * Copyright (C) 2011 Samsung Electronics
+ *
+ * Configuration settings for the SAMSUNG ORIGEN (EXYNOS4210) board.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __CONFIG_ITOP4412_H
+#define __CONFIG_ITOP4412_H
+
+#include
+
+#undef CONFIG_SKIP_LOWLEVEL_INIT
+#undef CONFIG_SKIP_LOWLEVEL_INIT_ONLY
+/* High Level Configuration Options */
+#define CONFIG_SPL_SERIAL_SUPPORT
+#define CONFIG_SPL_GPIO_SUPPORT
+#define CONFIG_DEBUG_UART
+#define CONFIG_DEBUG_UART_S5P
+#define CONFIG_DEBUG_UART_BASE 0x13830000 /* UART3 base address */
+#define CONFIG_DEBUG_UART_CLOCK (100000000) /* SCLK_UART3 is 100MHz */
+
+#define CONFIG_SYS_DCACHE_OFF 1
+
+/* ORIGEN has 4 bank of DRAM */
+#define CONFIG_NR_DRAM_BANKS 4
+#define CONFIG_SYS_SDRAM_BASE 0x40000000
+#define PHYS_SDRAM_1 CONFIG_SYS_SDRAM_BASE
+#define SDRAM_BANK_SIZE (256 << 20) /* 256 MB */
+
+/* memtest works on */
+#define CONFIG_SYS_MEMTEST_START CONFIG_SYS_SDRAM_BASE
+#define CONFIG_SYS_MEMTEST_END (CONFIG_SYS_SDRAM_BASE + 0x6000000)
+#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + 0x3E00000)
+
+#define CONFIG_SYS_TEXT_BASE 0x43E00000
+
+#define CONFIG_MACH_TYPE MACH_TYPE_ITOP4412
+
+/* select serial console configuration */
+#define CONFIG_SERIAL3
+#define CONFIG_BAUDRATE 115200
+
+/* Console configuration */
+#define CONFIG_SYS_CONSOLE_IS_IN_ENV
+#define CONFIG_SYS_CONSOLE_INFO_QUIET
+#define CONFIG_DEFAULT_CONSOLE "console=ttySAC1,115200n8\0"
+
+#define CONFIG_SYS_MEM_TOP_HIDE (1 << 20) /* ram console */
+
+#define CONFIG_SYS_MONITOR_BASE 0x00000000
+
+/* Power Down Modes */
+#define S5P_CHECK_SLEEP 0x00000BAD
+#define S5P_CHECK_DIDLE 0xBAD00000
+#define S5P_CHECK_LPA 0xABAD0000
+
+
+#define CONFIG_CMD_DHCP
+#define CONFIG_CMD_EXT2
+#define CONFIG_CMD_FS_GENERIC
+#define CONFIG_CMD_BOOTZ
+#define CONFIG_SUPPORT_RAW_INITRD
+
+/* MMC SPL */
+#define COPY_BL2_FNPTR_ADDR 0x02020030
+#define CONFIG_SPL_TEXT_BASE 0x02023400
+
+#define CONFIG_EXTRA_ENV_SETTINGS \
+ "loadaddr=0x40007000\0" \
+ "rdaddr=0x48000000\0" \
+ "kerneladdr=0x40007000\0" \
+ "ramdiskaddr=0x48000000\0" \
+ "console=ttySAC2,115200n8\0" \
+ "mmcdev=0\0" \
+ "bootenv=uEnv.txt\0" \
+ "loadbootenv=load mmc ${mmcdev} ${loadaddr} ${bootenv}\0" \
+ "importbootenv=echo Importing environment from mmc ...; " \
+ "env import -t $loadaddr $filesize\0" \
+ "loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \
+ "bootscript=echo Running bootscript from mmc${mmcdev} ...; " \
+ "source ${loadaddr}\0"
+#define CONFIG_BOOTCOMMAND \
+ "if mmc rescan; then " \
+ "echo SD/MMC found on device ${mmcdev};" \
+ "if run loadbootenv; then " \
+ "echo Loaded environment from ${bootenv};" \
+ "run importbootenv;" \
+ "fi;" \
+ "if test -n $uenvcmd; then " \
+ "echo Running uenvcmd ...;" \
+ "run uenvcmd;" \
+ "fi;" \
+ "if run loadbootscript; then " \
+ "run bootscript; " \
+ "fi; " \
+ "fi;" \
+ "load mmc ${mmcdev} ${loadaddr} uImage; bootm ${loadaddr} "
+
+#define CONFIG_CLK_1000_400_200
+
+/* MIU (Memory Interleaving Unit) */
+#define CONFIG_MIU_2BIT_21_7_INTERLEAVED
+
+#define CONFIG_ENV_IS_IN_MMC
+#define CONFIG_SYS_MMC_ENV_DEV 0
+#define CONFIG_ENV_SIZE (16 << 10) /* 16 KB */
+#define RESERVE_BLOCK_SIZE (512)
+#define BL1_SIZE (8 << 10) /*16 K reserved for BL1*/
+#define BL2_SIZE (16 << 10)
+
+#define CONFIG_ENV_OFFSET (RESERVE_BLOCK_SIZE + BL1_SIZE + BL2_SIZE)
+
+#define CONFIG_SPL_LDSCRIPT "board/samsung/common/exynos-uboot-spl.lds"
+#define CONFIG_SPL_MAX_FOOTPRINT (14 * 1024)
+
+#define CONFIG_SYS_INIT_SP_ADDR 0x02040000
+
+/* U-Boot copy size from boot Media to DRAM.*/
+#define COPY_BL2_SIZE 0x80000
+#define BL2_START_OFFSET ((CONFIG_ENV_OFFSET + CONFIG_ENV_SIZE)/512)
+#define BL2_SIZE_BLOC_COUNT (COPY_BL2_SIZE/512)
+
+#endif /* __CONFIG_ITOP4412_H */
15、修改arch/arm/cpu/armv7/Makefile，支持lowlevel_init：
diff --git a/arch/arm/cpu/armv7/Makefile b/arch/arm/cpu/armv7/Makefile
index 02e8778..47292ee 100644
--- a/arch/arm/cpu/armv7/Makefile
+++ b/arch/arm/cpu/armv7/Makefile
@@ -12,7 +12,7 @@ obj-y += cache_v7.o cache_v7_asm.o
obj-y += cpu.o cp15.o
obj-y += syslib.o
-ifneq ($(CONFIG_AM43XX)$(CONFIG_AM33XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX)$(CONFIG_TEGRA)$(CONFIG_MX6)$(CONFIG_MX7)$(CONFIG_TI81XX)$(CONFIG_AT91FAMILY)$(CONFIG_ARCH_SUNXI)$(CONFIG_ARCH_SOCFPGA)$(CONFIG_ARCH_MX7ULP)$(CONFIG_LS102XA),)
+ifneq ($(CONFIG_AM43XX)$(CONFIG_AM33XX)$(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX)$(CONFIG_TEGRA)$(CONFIG_MX6)$(CONFIG_MX7)$(CONFIG_TI81XX)$(CONFIG_AT91FAMILY)$(CONFIG_ARCH_SUNXI)$(CONFIG_ARCH_SOCFPGA)$(CONFIG_ARCH_MX7ULP)$(CONFIG_LS102XA)$(CONFIG_TARGET_ITOP4412),)
ifneq ($(CONFIG_SKIP_LOWLEVEL_INIT),y)
obj-y += lowlevel_init.o
endif
16、编辑arch/arm/mach-exynos/board.c：
diff --git a/arch/arm/mach-exynos/board.c b/arch/arm/mach-exynos/board.c
new file mode 100644
index 0000000..98fbf9d
--- /dev/null
+++ b/arch/arm/mach-exynos/board.c
@@ -0,0 +1,16 @@
+#include
+#include
+#include
+
+void s_init(void)
+{
+ writel(readl(0x1002330c) | 0x300, 0x1002330c);
+ writel(0, 0x11000c08);
+
+ /* led test */
+ writel(0x10, 0x11000060);
+ writel(0x2, 0x11000064);
+
+ writel(0x1, 0x11000100);
+ writel(0x1, 0x11000104);
+}
用于电源管理设置还有点亮led测试。
移植完成
(一) 编译
$ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
编译完成后得到2个文件：
- u-boot.bin
- spl/u-boot-spl.bin
(二) 使用mkbl2给SPL添加校验码
$ ./mkbl2 u-boot-spl.bin bl2.bin 14336
(三) 烧写
我的读卡器是/dev/sdc，大家按自己的具体情况修改。
$ dd iflag=dsync oflag=dsync if=E4412_N.bl1.bin of=/dev/sdc seek=1;dd iflag=dsync oflag=dsync if=bl2.bin of=/dev/sdc seek=17;dd iflag=dsync oflag=dsync if=u-boot.bin of=/dev/sdc seek=81;sync
成功运行
![基于iTop-4412的U-Boot 2017移植[1]：成功运行_第1张图片](http://img.e-com-net.com/image/info10/4dc6a747a6f94acfbaa8f26452de236c.jpg)
running
至此，分享结束～ 后续将进一步进行device tree source文件适配与驱动移植，敬请关注。
- 我的个人主页：http://www.techping.cn/
- 我的个人站点博客：http://www.techping.cn/blog/wordpress/
- 我的CSDN博客：http://blog.csdn.net/techping
- 我的：http://www.jianshu.com/users/b2a36e431d5e/timeline
- 我的GitHub：https://github.com/techping
欢迎相互follow～