6 Aug
2009
6 Aug
'09
8:13 a.m.
Dear Jean-Christophe,
2009/7/8 Jean-Christophe PLAGNIOL-VILLARD plagnioj@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