Dear Jean-Christophe,
2009/7/8 Jean-Christophe PLAGNIOL-VILLARD <plagn...@jcrosoft.com>:
>> +.globl lowlevel_init
>> +lowlevel_init:
>> + mov r11, lr
>> +
>> + led 0x0
>> +
>> + /* if REMAP bit is set -> memory had been initialzed */
>> +
>> + ldr r0, =CONFIG_SYS_AHBC_BASE
>> + ldr r1, [r0, #FTAHBC020_OFFSET_ICR]
>> + tst r1, #FTAHBC020_ICR_REMAP @ test REMAP bit
>> + bne skip_remap
>> +
>> + led 0x1
>> +
>> + bl init_sdmc
>> +
>> + led 0x2
>> +
>> + /*
>> + * copy U-Boot to RAM
>> + */
>> +copy_code:
>> + ldr r0, =ROM_DEFAULT_BASE /* r0 <- source address */
>> + ldr r1, =SDRAM_DEFAULT_BASE /* r1 <- target address */
>> +
>> + ldr r2, .LC5
>> + ldr r3, .LC6
>> + sub r2, r3, r2 /* r2 <- size of armboot */
>> + add r2, r0, r2 /* r2 <- source end address */
>> +
>> + led 0x3
>> +
>> +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
>> +
> I do not like to do this twice we need to find an otherway
> do we really need to run in SDRAM before remap?
I am afraid so.
u-boot needs to be copied to SDRAM first to do the remap
(swap ROM and SDRAM bank) to make SDRAM base becomes 0x0.
cpu/arm920t/start.S then relocates u-boot to the end of SDRAM.
Anyway, I have an idea now.
I can submit a version that do not do the bank swap
(SDRAM stays at 0x10000000).
The the mainline keeps beautiful as you wish.
Then I create another patch to do the bank swap for our internal use.
This should be a win-win. :-)
best regards,
Po-Yu Chuang
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