请教一个u_boot程序问题

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神仙乞丐|

楼主 | 2007-8-4 13:25 | 只看该作者回帖奖励

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boot程序, ST, start, AD, ADDR

请教一个问题
relocate:                /* relocate U-Boot to RAM        */
    adr    r0, _start        /* r0 <- current position of code   */
    ldr    r1, _TEXT_BASE        /* test if we run from flash or RAM */
    cmp     r0, r1                  /* don't reloc during debug         */
    beq     stack_setup

    ldr    r2, _armboot_start
    ldr    r3, _bss_start
    sub    r2, r3, r2        /* r2 <- size of armboot            */
    add    r2, r0, r2        /* r2 <- source end address         */

copy_loop:
    ldmia    r0!, {r3-r10}        /* copy from source address [r0]    */
    stmia    r1!, {r3-r10}        /* copy to   target address [r1]    */
    cmp    r0, r2            /* until source end addreee [r2]    */
    ble    copy_loop

这里的_armboot_start是等于_start这个吗_bss_start 地址又是什么我只查到了                0x33c2ce7c                __bss_start = .

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