Re: Wrong relocation with Mini2440

[luigi origa <luigi.origa@gmail.com>]

I tried enabling pbl with the default values and it works. I tried
also changing the address at 0x33c00000 (instead the default
0x33e00000) with pbl disabled and works again.

Thanks for the help.

Luigi




2014-10-10 8:42 GMT+02:00 Sascha Hauer <s.hauer@pengutronix.de>:
> Hi Luigi,
>
> On Fri, Oct 10, 2014 at 12:24:40AM +0200, luigi origa wrote:
>> 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+10 j
>> 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".
>
> Do you have PBL enabled? Could you enable PBL if not? Additionally
> could you revert:
>
> commit 558d72dc5116fc6275ea77c783cc65d6d1a5b521
> Author: Michael Olbrich <m.olbrich@pengutronix.de>
> Date:   Sun May 18 16:46:29 2014 +0200
>
>     ARM Samsung: fix booting from NAND with pbl
>
>     The ARM pbl is linked at (TEXT_BASE - SZ_2M). This conflicts with the temporary
>     stack used in s3c24x0_nand_boot. Moving the stack to (TEXT_BASE - SZ_2M) fixes
>     this problem. With this patch a compressed barebox with pbl can boot on
>     mini2440 from NAND.
>
>     Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
>     Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
>
> I suspect This patch fixed booting with PBL enabled but broke booting
> without PBL.
>
> Sascha
>
>
> --
> Pengutronix e.K.                           |                             |
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