omap-l138烧写程序之 - 启动模式选择及确认
omap-l138烧写程序之 - 启动模式选择及确认
本文介绍烧写omap-l138程序到nand flash之前的准备工作 – 启动模式选择。
1 启动模式选择
下载Using the OMAP-L132/L138Bootloader.pdf，这个文档专门讲了omap-l138的各种启动模式。
启动模式选择如下图所示：
对于omap-l138来说，BOOT[7:0]和引脚之间的关系如下表所示：
| BOOT位 | BOOT7 | BOOT6 | BOOT5 | BOOT4 | BOOT3 | BOOT2 | BOOT1 | BOOT0 |
|---|---|---|---|---|---|---|---|---|
| 引脚 | P4 | R3 | R2 | R1 | T3 | T2 | T1 | U3 |
我的板子上BOOT0固定为下拉，BOOT1固定为上拉，只有BOOT2~BOOT4可通过跳线的方式选择上拉或下拉。板上的nand flash为K9NBG08U5A，通过跳线将T2、T3上拉，选择启动模式为NAND 8，nand flash的原理图如下所示：
2 启动模式确认
一般情况下，启动模式选择对应的引脚的电压都会经过电阻分压得到，假如引脚上的电压为2.8V，不确定omap认为是低电平还是高电平，那么，可以按照以下方法来确认。
（1）需要用到OMAPL1x_debug.gel，这是官方给出的gel文件，可以在这里下载到http://processors.wiki.ti.com/index.php/OMAP-L1x_Debug_Gel_Files，下载保存到本地磁盘备用。
（2）连接arm核，方法是：View -> Target Configurations -> 右击配置好的ccxml文件 -> Launch Selected Configurations -> 在Debug面板那里，右击 ARM9_0 -> Connect Target，连接上ARM核。
（3）打开 Gel Files面板，方法如下图所示：
打开 Gel Files面板后，如下图所示：
（4）加载gel文件，右击Gel Files面板，选择菜单 Load Gel，浏览到OMAPL1x_debug.gel所在的目录并选择加载，加载后如下图所示：
（5）验证启动模式，方法是选中OMAPL1x_debug.gel，再单击菜单Scripts -> Diagnostics -> Run_All，如下图所示：
运行后，在Console面板会输出一些信息，其中就有启动模式选择的信息，我这里给出CCS打印出的信息如下：
---------------------------------------------
ARM9_0: GEL Output: | Device Information |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: DEV_INFO_00 = 0x1B7D102F
ARM9_0: GEL Output: DEV_INFO_01 = 0x00000000
ARM9_0: GEL Output: DEV_INFO_02 = 0x0000000E
ARM9_0: GEL Output: DEV_INFO_03 = 0x00000033
ARM9_0: GEL Output: DEV_INFO_04 = 0x00000000
ARM9_0: GEL Output: DEV_INFO_05 = 0x000003E0
ARM9_0: GEL Output: DEV_INFO_06 = 0x00000200
ARM9_0: GEL Output: DEV_INFO_07-DEV_INFO_08-DEV_INFO_09-DEV_INFO_10-DEV_INFO_11-DEV_INFO_12 = 0-0-6525781-3-32-30
ARM9_0: GEL Output: DEV_INFO_13,DEV_INFO_14,DEV_INFO_15,DEV_INFO_16 = 3,0,0,2911
ARM9_0: GEL Output: -----
ARM9_0: GEL Output: DEV_INFO_17 = 0x00030003
ARM9_0: GEL Output: DEV_INFO_18 = 0x00000000
ARM9_0: GEL Output: DEV_INFO_19 =ARM9_0: GEL Output: 0ARM9_0: GEL Output: 0ARM9_0: GEL Output: 0ARM9_0: GEL Output: 0ARM9_0: GEL Output: 0ARM9_0: GEL Output:
ARM9_0: GEL Output: -----
ARM9_0: GEL Output: DEV_INFO_20 = 0x30303864
ARM9_0: GEL Output: DEV_INFO_21 = 0x3830306B
ARM9_0: GEL Output: DEV_INFO_22 = 0x30303864
ARM9_0: GEL Output: DEV_INFO_23 = 0x3830306B
ARM9_0: GEL Output: -----
ARM9_0: GEL Output: DEV_INFO_24 = 0x0301E020
ARM9_0: GEL Output: DEV_INFO_25 = 0x00639355
ARM9_0: GEL Output: DEV_INFO_06 = 0x00000200
ARM9_0: GEL Output: DEV_INFO_26 = 0x16BE0003
ARM9_0: GEL Output:
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: | BOOTROM Info |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: ROM ID: d800k008
ARM9_0: GEL Output: Silicon Revision 2.1
ARM9_0: GEL Output: Boot pins: 14
ARM9_0: GEL Output: Boot Mode: NAND 8
ARM9_0: GEL Output:
ROM Status Code: 0x00000000
Description:ARM9_0: GEL Output: No error
ARM9_0: GEL Output:
Program Counter (PC) = 0xCA08AAA4
ARM9_0: GEL Output:
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: | Clock Information |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output:
ARM9_0: GEL Output: PLLs configured to utilize crystal.
ARM9_0: GEL Output: ASYNC3 = PLL0_SYSCLK2
ARM9_0: GEL Output:
ARM9_0: GEL Output: NOTE: All clock frequencies in following PLL sections are based
ARM9_0: GEL Output: off OSCIN = 24 MHz. If that value does not match your hardware
ARM9_0: GEL Output: you should change the #define in the top of the gel file, save it,
ARM9_0: GEL Output: and then reload.
ARM9_0: GEL Output:
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: | PLL0 Information |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output:
ARM9_0: GEL Output: PLL0_SYSCLK1 = 372 MHz
ARM9_0: GEL Output: PLL0_SYSCLK2 = 186 MHz
ARM9_0: GEL Output: PLL0_SYSCLK3 = 124 MHz
ARM9_0: GEL Output: PLL0_SYSCLK4 = 93 MHz
ARM9_0: GEL Output: PLL0_SYSCLK5 = 124 MHz
ARM9_0: GEL Output: PLL0_SYSCLK6 = 372 MHz
ARM9_0: GEL Output: PLL0_SYSCLK7 = 62 MHz
ARM9_0: GEL Output:
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: | PLL1 Information |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output:
ARM9_0: GEL Output: PLL1_SYSCLK1 = 300 MHz
ARM9_0: GEL Output: PLL1_SYSCLK2 = 150 MHz
ARM9_0: GEL Output: PLL1_SYSCLK3 = 100 MHz
ARM9_0: GEL Output:
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: | PSC0 Information |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output:
ARM9_0: GEL Output: State Decoder:
ARM9_0: GEL Output: 0 = SwRstDisable (reset asserted, clock off)
ARM9_0: GEL Output: 1 = SyncReset (reset assered, clock on)
ARM9_0: GEL Output: 2 = Disable (reset de-asserted, clock off)
ARM9_0: GEL Output: 3 = Enable (reset de-asserted, clock on)
ARM9_0: GEL Output: >3 = Transition in progress
ARM9_0: GEL Output:
ARM9_0: GEL Output: Module 0: EDMA3CC (0) STATE = 3
ARM9_0: GEL Output: Module 1: EDMA3 TC0 STATE = 3
ARM9_0: GEL Output: Module 2: EDMA3 TC1 STATE = 3
ARM9_0: GEL Output: Module 3: EMIFA (BR7) STATE = 3
ARM9_0: GEL Output: Module 4: SPI 0 STATE = 3
ARM9_0: GEL Output: Module 5: MMC/SD 0 STATE = 3
ARM9_0: GEL Output: Module 6: AINTC STATE = 3
ARM9_0: GEL Output: Module 7: ARM RAM/ROM STATE = 3
ARM9_0: GEL Output: Module 9: UART 0 STATE = 3
ARM9_0: GEL Output: Module 10: SCR 0 (BR0/1/2/8) STATE = 3
ARM9_0: GEL Output: Module 11: SCR 1 (BR4) STATE = 3
ARM9_0: GEL Output: Module 12: SCR 2 (BR3/5/6) STATE = 3
ARM9_0: GEL Output: Module 13: PRUSS STATE = 0
ARM9_0: GEL Output: Module 14: ARM STATE = 3
ARM9_0: GEL Output: Module 15: DSP STATE = 3
ARM9_0: GEL Output:
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output: | PSC1 Information |
ARM9_0: GEL Output: ---------------------------------------------
ARM9_0: GEL Output:
ARM9_0: GEL Output: State Decoder:
ARM9_0: GEL Output: 0 = SwRstDisable (reset asserted, clock off)
ARM9_0: GEL Output: 1 = SyncReset (reset assered, clock on)
ARM9_0: GEL Output: 2 = Disable (reset de-asserted, clock off)
ARM9_0: GEL Output: 3 = Enable (reset de-asserted, clock on)
ARM9_0: GEL Output: >3 = Transition in progress
ARM9_0: GEL Output:
ARM9_0: GEL Output: Module 0: EDMA3CC (1) STATE = 3
ARM9_0: GEL Output: Module 1: USB0 (2.0) STATE = 3
ARM9_0: GEL Output: Module 2: USB1 (1.1) STATE = 3
ARM9_0: GEL Output: Module 3: GPIO STATE = 3
ARM9_0: GEL Output: Module 4: UHPI STATE = 3
ARM9_0: GEL Output: Module 5: EMAC STATE = 3
ARM9_0: GEL Output: Module 6: DDR2 and SCR F3 STATE = 3
ARM9_0: GEL Output: Module 7: MCASP0 + FIFO STATE = 3
ARM9_0: GEL Output: Module 8: SATA STATE = 3
ARM9_0: GEL Output: Module 9: VPIF STATE = 3
ARM9_0: GEL Output: Module 10: SPI 1 STATE = 3
ARM9_0: GEL Output: Module 11: I2C 1 STATE = 3
ARM9_0: GEL Output: Module 12: UART 1 STATE = 3
ARM9_0: GEL Output: Module 13: UART 2 STATE = 3
ARM9_0: GEL Output: Module 14: MCBSP0 + FIFO STATE = 3
ARM9_0: GEL Output: Module 15: MCBSP1 + FIFO STATE = 3
ARM9_0: GEL Output: Module 16: LCDC STATE = 3
ARM9_0: GEL Output: Module 17: eHRPWM (all) STATE = 3
ARM9_0: GEL Output: Module 18: MMC/SD 1 STATE = 3
ARM9_0: GEL Output: Module 19: UPP STATE = 3
ARM9_0: GEL Output: Module 20: eCAP (all) STATE = 3
ARM9_0: GEL Output: Module 21: EDMA3 TC2 STATE = 3
ARM9_0: GEL Output: Module 24: SCR-F0 Br-F0 STATE = 3
ARM9_0: GEL Output: Module 25: SCR-F1 Br-F1 STATE = 3
ARM9_0: GEL Output: Module 26: SCR-F2 Br-F2 STATE = 3
ARM9_0: GEL Output: Module 27: SCR-F6 Br-F3 STATE = 3
ARM9_0: GEL Output: Module 28: SCR-F7 Br-F4 STATE = 3
ARM9_0: GEL Output: Module 29: SCR-F8 Br-F5 STATE = 3
ARM9_0: GEL Output: Module 30: Br-F7 (DDR Contr) STATE = 3
ARM9_0: GEL Output: Module 31: L3 RAM, SCR-F4, Br-F6 STATE = 3其中的BOOTROM Info有启动模式选择的结果
Boot Pins 为14，对应的二进制数为 0000 1110，说明启动模式选择和预想中的一致。