mini6410的u-boot-2010.12的移植《二》-优快云博客

本文链接：https://blog.youkuaiyun.com/viewsky11/article/details/42294427

本文档详细介绍了如何在boards.cfg文件中为Mini6410平台添加配置，并展示了如何修改start.S文件来实现从内部ROM或NAND闪存启动的过程。文中还涉及了针对不同启动方式对GPIO寄存器的设置。

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boards.cfg文件中增加mini6410的平台定义：

修改arch/arm/cpu/arm1176/start.S文件：

===================================================================================

====================================================================================

添加：

/*
* We are done. Do not return, instead branch to second part of board
* initialization, now running from RAM.
*/
#ifdef CONFIG_NAND_SPL

/*check boot status */
#define MEM_CFG_STAT 0x7E00F12C

ldr r1, =MEM_CFG_STAT /* address of reg MEM_CFG_STAT*/
ldr r0, [r1]
mov r1, #0x60
and r1, r0, r1 /*r1 = MEM_CFG_STAT & CFG_BOOT_LOC */

cmp r1, #0x60 /*Internal ROM*/
beq boot_from_irom
cmp r1, #0x00 /*Stepping Stone area in NFCON*/
beq boot_from_nand
b reset

boot_from_irom:
/*MINI6410 boot from Internal ROM-->MMC boot*/
#if defined(CONFIG_MINI6410_LED)
/* R/W, Pull-up disable register */
mov r1, #ELFIN_GPIO_BASE_8BIT
add r1, r1, #ELFIN_GPK_BASE_8BIT
ldr r2, =0x11111111
str r2, [r1, #GPKCON0_OFFSET_8BIT]
ldr r2, =0x0000AAAA
str r2, [r1, #GPKPUD_OFFSET_8BIT]
ldr r2, =0x0000ff7f
str r2, [r1, #GPKDAT_OFFSET_8BIT]
#endif
b mmc_boot_copy

boot_from_nand:
/*MINI6410 boot from Nand Flash*/
#if defined(CONFIG_MINI6410_LED)
/* R/W, Pull-up disable register */
mov r1, #ELFIN_GPIO_BASE_8BIT
add r1, r1, #ELFIN_GPK_BASE_8BIT
ldr r2, =0x11111111
str r2, [r1, #GPKCON0_OFFSET_8BIT]
ldr r2, =0x0000AAAA
str r2, [r1, #GPKPUD_OFFSET_8BIT]
ldr r2, =0x0000ffff
str r2, [r1, #GPKDAT_OFFSET_8BIT]
#endif
b nand_boot
#else
ldr r0, _board_init_r_ofs
adr r1, _start
add lr, r0, r1
add lr, lr, r9
/* setup parameters for board_init_r */
mov r0, r5 /* gd_t */
mov r1, r6 /* dest_addr */
/* jump to it ... */
mov pc, lr