[U-Boot] [RFC] [PATCH V2] arm: arm926ejs: use ELF relocations

[Albert ARIBAUD]

Le 05/10/2010 10:33, Heiko Schocher a écrit :
> Hello Reinhard,
>
> Reinhard Meyer wrote:
>> I _think_ the linker file needs a .align there:
>>
>> (.data ends with a non-aligned address!)
>
> actually trying on the tx25 board, and I see a hang after
> the dram output too:
>
> DRAM:  32 MiB
>
> I inserted a breakpoint in start.S at clear_bss, never reached...
>
> Maybe the fixloop
>
> start.S:
> [...]
> fixnext:
>          str     r1, [r0]
>          add     r2, r2, #8      /* each rel.dyn entry is 8 bytes */
>          cmp     r2, r3
>          ble     fixloop
> #endif
> #endif  /* #ifndef CONFIG_SKIP_RELOCATE_UBOOT */
>
> clear_bss:
>
> never reaches a end ... but just debugging it ...
>
> register dump in fixloop:
>
> TX25>ti;r
>      Core number       : 0
>      Core state        : debug mode (ARM)
>      Debug entry cause : Single Step
>      Current PC        : 0x812000d8
>      Current CPSR      : 0x800000d3 (Supervisor)
> GPR00: 81fbe020 81fbe1a0 81224364 812285cc
> GPR04: 81ebdf88 81ebdf8c 81fe6ac8 81fbe000
> GPR08: 00000017 00dbe000 812285cc 00000000
> GPR12: 00000000 81ebdf88 812006f4 812000d8
> PC   : 812000d8    CPSR: 800000d3
> TX25>
>
> r2 and r3 are a multiple of 8, so this must end, but never
> see it ending ...

Ihe loop exit test is a ble, not a bne, so even if r2 or r3 were not 
properly aligned, this should still exit eventually.

A reason why it would not, though, is if the loop trashes the code in 
RAM. That can happen if e.g. TEXT_BASE is wrong (my bad). In two hour's 
time I will build (not test) for tx25 and then do a quick check on the 
content of .rel.dyn and .dynsym in the resulting u-boot.

> bye,
> Heiko

Amicalement,
-- 
Albert.