I'm trying to have barebox working on my mini2440. After many test,
today i got a jtag interface and after some check i found this:
- source s3c24x0_nand_boot -
2: ldr sp, =(TEXT_BASE - SZ_2M) /* Setup a temporary stack in SDRAM */
/*
* We still run at a location we are not linked to. But lets still running
* from the internal SRAM, this may speed up the boot
*/
push {lr}
bl nand_boot
pop {lr}
/*
* Adjust the return address to the correct address in SDRAM
*/
ldr r1, =(TEXT_BASE - SZ_2M)
add lr, lr, r1
mov pc, lr
- compiled s3c24x0_nand_boot -
ROM:00000320 loc_320 ; CODE XREF:
s3c24x0_nand_boot+10j
ROM:00000320 MOV SP, #0x33C00000
ROM:00000324 STMFD SP!, {LR}
ROM:00000328 BL nand_boot
ROM:0000032C LDMFD SP!, {LR}
ROM:00000330 MOV R1, #0x33C00000
ROM:00000334 ADD LR, LR, R1
- source nand_boot -
void __nand_boot_init nand_boot(void)
{
void *dest = _text;
int size = ld_var(_barebox_image_size);
int page = 0;
s3c24x0_nand_load_image(dest, size, page);
}
- compiled nand_boot-
ROM:000001E0 MOV R1, R0 // size
ROM:000001E4 LDR R0, =0x33E00000 // *dest
ROM:000001E8 MOV R2, #0
ROM:000001EC LDMFD SP!, {R4,LR}
ROM:000001F0 B s3c24x0_nand_load_image
0x33c00000 is the sdram stack where the program should be copied from
nand. Unfortunately the function nand_boot copy from nand to sdram
@0x33e00000.
When s3c24x0_nand_boot try to jump in sdram, use a wrong address
(0x33c00220 instead 0x33e00220).
I don't know if the problem is in "TEXT_BASE - SZ_2M" or "_text".
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