本次更新,修复了SD卡写入出现"data CRC error"的bug。我曾在u-boot for tiny210 ver2.1做过对这个bug的修复,我也提到过上次做的修改是不安全的,可能会对其它平台的代码产生副作用。而本次修改彻底解决了这个问题。感谢kasim,本次修改的源码由kasim提供。由于时间所限这次不再详细分析过程。只贴上本次修改的补丁文件内容。以后有时间,我会具体分析修改原因。
历史版本下载:
下面的链接提供了历史版本的源码
ver2.2源码下载: u-boot for tiny210 ver2.2
ver2.1源码下载:u-boot for tiny210 ver2.2
ver2.1源码下载:u-boot for tiny210 ver2.1
ver2.0源码下载:u-boot for tiny210 ver2.0
--- a/board/samsung/tiny210/tiny210.c
+++ b/board/samsung/tiny210/tiny210.c
@@ -32,6 +32,8 @@
#include <asm/io.h>
#include <asm/arch/gpio.h>
#include <asm/arch/mmc.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/clock.h>
/*Add by lk for DM9000 driver */
//#include <drivers/net/dm9000x.h>
#include <netdev.h>
@@ -302,9 +304,13 @@ void nand_init(void)
#endif
#ifdef CONFIG_GENERIC_MMC
+#define MOUTMMC (50000000) /* 50MHz */
int board_mmc_init(bd_t *bis)
{
int i;
+ struct s5pc110_clock *clk =
+ (struct s5pc110_clock *)samsung_get_base_clock();
+ unsigned long clk_src, clk_div, mpll, div;
/*
* MMC0 GPIO
@@ -336,6 +342,19 @@ int board_mmc_init(bd_t *bis)
/* GPG1[0:6] drv 4x */
s5p_gpio_set_drv(&s5pc110_gpio->g1, i, GPIO_DRV_4X);
}
+ clk_src = readl(&clk->res9[0]); /* CLK_SRC4 */
+ clk_src &= ~((0xf << 4) | 0xf);
+ clk_src |= (0x6 << 4) | 0x6; /* Set MMC0/1_SEL to SCLK_MPLL */
+
+ mpll = get_pll_clk(MPLL);
+ div = ((mpll + MOUTMMC) / MOUTMMC) - 1;
+
+ clk_div = readl(&clk->div4);
+ clk_div &= ~((0xf << 4) | 0xf);
+ clk_div |= (div << 4) | div;
+
+ writel(clk_src, &clk->res9[0]);
+ writel(clk_div, &clk->div4);
return (s5p_mmc_init(0, 4) || s5p_mmc_init(1, 4));
}
如果您现在拿到的是从我CSDN资源上下载的源码,您还需修改drivers/mmc/s5p_mmc.c去掉对下面红色代码部分的屏蔽:
225: while (1) {
226 mask = readl(&host->reg->norintsts);
227
228 if (mask & (1 << 15)) {
229 /* Error Interrupt */
230 writel(mask, &host->reg->norintsts);
231 printf("%s: error during transfer: 0x%08x\n" ,
232 __func__, mask);
233 return -1;
234 } else if (mask & (1 << 3)) {