1、Vi Makefile33行:COBJS-y := smdk4212.o /改为:= yygy4412.o37行;SOBJS += mem_init_smdk4212.o /改为:SOBJS += mem_init_yygy4412.o38 ;SOBJS += clock_init_smdk4212.o /改为:SOBJS += clock_init_yygy4412.oCd , cd yygy4412-uboot/yygy4412-uboot 修改boards.cfg 添加yygy4412 arm armv7 yygy4412 samsung exynosCp -av include/con
2、figs/smdk4412.h include/configs/yygy4412.hVi include/configs/yygy4412.h 265: #define CONFIG_SYS_PROMPT SMDK4412 # 改为:#define CONFIG_SYS_PROMPT YYGY4412 # 319:#define CONFIG_IDENT_STRING for SMDK4412改为; for YYGY4412Vi u-boot.lds board/samsung/smdk4212/libsmdk4212.o (.text)修改为 :board/samsung/yygy4412/
3、libyygy4412.o (.text)5.编译 make yygy4412_config make6.制作UBOOT因CPU exynos_4412的启动过程是 BL0 /BL0固化在iram中的程序 (关闭看门狗,关闭中断及MMU,时钟设置,检测om决定启动方式,拷贝bl1到iram中 BL1 b1.asm BL2 u-boot-iTOP-4412.bin改 为u-boot-yygy-4412.bin mv u-boot-iTOP-4412.bin $ROOT_DIR 改为mv u-boot-yygy-4412.bin $ROOT_DIR chmod 777 ./build.sh./bu
4、ild_uboot.sh 编译 生成u-boot-yygy-4412.bin7.加入点灯代码,确认uboot运行。Vi board/samsung/yygy4412/lowlevel_init.S 96: /* PS-Hold high */ 电源管理 ldr r0, =0x1002330c ldr r1, r0 orr r1, r1, #0x300 str r1, r0 后添加ldr r0, =0x11000c08 ldr r1, =0x0 str r1, r0/* Clear MASK_WDT_RESET_REQUEST */ ldr r0, =0x1002040c ldr r1, =0x
5、00/led test ldr r0, =0x11000060 /GPK11 bic r1, r1, #0xf0 orr r1, r1, #0x10 ldr r1, r0, #4 orr r1, r1, #2 str r1, r0, #4保存重新编译,烧到开发板,运行,可 以看灯一闪而过。但是串口无任何输出。8.开启串口开发板串口为UART2.Vi include/configs/yygy4412.h 添加#define DEBUG 输出调试信息161: #define CONFIG_SERIAL1 1改为:#define CONFIG_SERIAL2 1保存编译,烧到开发板,可以看到串口输出
6、信息,进入UBOOT读秒,读取内核,但是EMMC读取速度超慢,无法忍受,但最终读取完成。9.修改MMC驱动。加快内核的读取速度。Vi driversmmcmmc.c1271; 在函数mmc_init中mmc_set_clock(mmc, 1);mmc_set_bus_width(mmc, MMC_BUS_WIDTH_1);修改为:mmc_set_clock(mmc, 40000000); /40Mmmc_set_bus_width(mmc, MMC_MODE_4BIT);保存编译,烧到开发板,可以看到串口输出信息,进入UBOOT读秒,读取内核EMMC读取速度超快,读取完成。但是无法加载内核。打
7、印信息如下 :# main_loop: bootcmd=movi read kernel 0 40008000;movi read rootfs 0 41000000 100000;bootm 40008000 41000000Hit any key to stop autoboot: 0 reading kernel.device 0 Start 1063, Count 8192 MMC read: dev # 0, block # 1063, count 8192 . 8192 blocks read: OKcompleted reading RFS.device 0 Count 9255
8、, Start 2048 dev # 0, block # 9255, count 2048 . 2048 blocks read:# Current stack ends at 0xc3cfbdc8 * kernel: cmdline image address = 0x40008000Wrong Image Format for bootm commandERROR: cant get kernel image!10.修改EMMC分区信息。Vi archarmincludeasmarch-exynosMovi_partition.h修改21-57行为:#define PART_SIZE_F
9、WBL1 (8 * 1024)#define PART_SIZE_BL1 (16 * 1024)#define PART_SIZE_UBOOT (495 * 1024)#define PART_SIZE_KERNEL (6 * 1024 * 1024)#define PART_SIZE_ROOTFS (2 * 1024 * 1024)/ 2M/#define PART_SIZE_TZSW (156 * 1024)#define PART_SIZE_TZSW (24 * 1024) /为了与迅为UBOOT中的 environment start 544一致。#define MOVI_FWBL1_
10、BLKCNT (PART_SIZE_FWBL1 / MOVI_BLKSIZE)#define MOVI_BL1_BLKCNT (PART_SIZE_BL1 / MOVI_BLKSIZE)#define MOVI_ENV_BLKCNT (CONFIG_ENV_SIZE / MOVI_BLKSIZE) /* 16KB */#define MOVI_UBOOT_BLKCNT (PART_SIZE_UBOOT / MOVI_BLKSIZE) /* 328KB */#define MOVI_ZIMAGE_BLKCNT (PART_SIZE_KERNEL / MOVI_BLKSIZE) /* 4MB */
11、#define MOVI_ROOTFS_BLKCNT (PART_SIZE_ROOTFS / MOVI_BLKSIZE) /* 26MB */#define MOVI_TZSW_BLKCNT (PART_SIZE_TZSW / MOVI_BLKSIZE) /* 160KB */#define MOVI_UBOOT_POS (eFUSE_SIZE / MOVI_BLKSIZE) + MOVI_FWBL1_BLKCNT + MOVI_BL1_BLKCNT)#define MOVI_TZSW_POS (eFUSE_SIZE / MOVI_BLKSIZE) + MOVI_FWBL1_BLKCNT +
12、MOVI_BL1_BLKCNT + MOVI_UBOOT_BLKCNT)#define ENV_START_BLOCK MOVI_FWBL1_BLKCNT+MOVI_BL1_BLKCNT+MOVI_UBOOT_BLKCNT+MOVI_TZSW_BLKCNT+1 Vi archarmcpuarmv7exynosMovi_partition.c25: 修改函数init_raw_area_tableImage2部分修改为:image2.start_blk = location;image2.used_blk = MOVI_UBOOT_BLKCNT + MOVI_BL1_BLKCNT + MOVI_F
13、WBL1_BLKCNT;image2.size = PART_SIZE_UBOOT + PART_SIZE_FWBL1 + PART_SIZE_BL1;image2.attribute = 0x2;strcpy(image2.description, u-boot);dbg(u-boot: %dn, image2.start_blk);Image3部分:image3.start_blk = image2.start_blk + MOVI_UBOOT_BLKCNT;修改为:image3.start_blk = image2.start_blk + MOVI_UBOOT_BLKCNT + MOVI
14、_BL1_BLKCNT + MOVI_FWBL1_BLKCNT;Image4部分image4.attribute = 0x10;strcpy(image4.description, environment后改为:if (location = 0) image4.start_blk = image4.start_blk + 2;else image4.start_blk = image4.start_blk + 1; 为了与迅为UBOOT中的environment start 544一致。加载内核成功,文件系统也成功加载。但是UBOOT下,fastboot失败!Starting download
15、 of 527104 bytes-ERROR: DMA Address is not aligned by 8-11.使用fastboot功能Vi includeconfigsyygy4412.h167: #undef CONFIG_USB_CPUMODE修改为#define CONFIG_USB_CPUMODE保存编译,烧到开发板.fastboot命令成功 12.环境变量的保存。到目前为止,环境变量是默认的。迅为开发板环境变量保存在错误的分区了,只要使用saveenv命令,就会破坏EMMC中的文件系统。导致加载文件系统不断重启而失败。最后连fastboot命令都失效。EMMC分区被破坏。重新
16、分区,烧UBOOT, 文件系统。在函数mmc_read_ext_csd中。959: if (ext_csd_struct 6) printf(unrecognised EXT_CSD structure version %dn, ext_csd_struct); err = -1; goto out; 改为if (ext_csd_struct 5) & (7 != ext_csd_struct) 因刚好version =7;保存编译,烧到开发板.saveenv命令成功 ,现在读取的是EMMC中的环境变量。13. 疑问:迅为提供的UBOOT E4412_N.bl1.SCP2G.bin 已经将整个
17、UBOOT拷贝到内存中。测试是否如此?修改lowlevel_init.Sload_uboot函数修改为:/*/.globl load_ubootload_uboot: push lr ldr r0, =INF_REG_BASE ldr r1, r0, #INF_REG3_OFFSET cmp r1, #BOOT_MMCSD beq mmcsd_boot cmp r1, #BOOT_EMMC beq emmc_boot cmp r1, #BOOT_EMMC_4_4 beq emmc_boot_4_4 cmp r1, #BOOT_SEC_DEV beq mmcsd_bootsecond_mmcsd
18、_boot: ldr r3, =BOOT_MMCSD str r3, r0, #INF_REG3_OFFSETmmcsd_boot:#ifdef CONFIG_CLK_1000_400_200 ldr r0, =ELFIN_CLOCK_BASE ldr r2, =CLK_DIV_FSYS2_OFFSET ldr r1, r0, r2 orr r1, r1, #0xf str r1, r0, r2#endif mov r0, #SDMMC_CH2 str r0, _boot_device bl load_uboot_image b load_uboot_exitemmc_boot:#if def
19、ined(CONFIG_CLK_1000_400_200) | defined(CONFIG_CLK_1000_200_200) | defined(CONFIG_CLK_800_400_200) ldr r2, =CLK_DIV_FSYS1_OFFSET orr r1, r1, #0x3 str r1, r0, r2 mov r0, #EMMCemmc_boot_4_4: ldr r2, =CLK_DIV_FSYS3_OFFSET orr r1, r1, #0x3/* mmc ch4 devider value change */ bl mmc_ch4_devider_change mov
20、r0, #EMMC_4_4/* store second boot information in DRAM */ ldr r0, =CONFIG_PHY_UBOOT_BASE ldr r2, =0x2000 cmp r1, r2 bne second_mmcsd_bootload_uboot_exit: pop pc/*/149行附近时钟,内存初始化部分。 ldr r0, =0xff000fff bic r1, pc, r0 /* r0 - current base addr of code */ ldr r2, _TEXT_BASE /* r1 - original base addr in ram */ bic r2, r2, r0 /* r0 cmp r1, r2 /* compare r0, r1 */ beq after_copy /* r0 = r1 then skip sdram init and u-boot.bin loading */ ldr r0, =CHIP_ID_BASE lsr r1, r1, #8 and r1, r1, #3 cmp r1, #2 bne v310_1 bl mem_ctrl_asm_init bl system_cl
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