[Arm-netbook] u-boot spl bss section clean problem

[Tom Cubie]

On Wed, Feb 22, 2012 at 3:11 AM, Manuel Braga <mul.braga at gmail.com> wrote:

> On Tue, 21 Feb 2012 22:13:15 +0800 Tom Cubie <mr.hipboi at gmail.com>
> wrote:
> > Hi,
> >     i met this problem on u-boot spl. In u-boot relocate_code, there
> > is a routine clean the .bss section in start.S(code here[1]), but
> > there is not bss section in my build. The u-boot-spl.map file is
> > here [2]. I looked the register when calling clear_bss routine, r0
> > and r1 are both 0x50000000, so the clear loop never stops. Can anyone
> > tell me why no bss section after the buid? The u-boot code is at [3].
> >
> > [1] http://nopaste.us/5923.html
> > [2] http://nopaste.us/5922.html
> > [3]
> >
> http://git.hands.com/?p=u-boot.git;a=shortlog;h=refs/heads/lichee-dev-mmc
>
> Hi, i don't have any experience with u-boot, but just downloaded and
> compiled, and is as you say, the bss section has size zero.
> If this is wrong or right, i don't know.
>
> But as by the linker script(u-boot-spl.lds)
>       .bss :
>        {
>                . = ALIGN(4);
>                __bss_start = .;
>                *(.bss*)
>                . = ALIGN(4);
>                __bss_end__ = .;
>        } >.sdram
>
> if there isn't any .bss* objects, __bss_end__ will be equal to
> __bss_start, you saw in the registers both set to 0x50000000
>
>
> Shouldn't clear_bss also handle this case of zero size?
> In other arm cpus start.S, clear_bss is totaly removed with
> #ifndef CONFIG_SPL_BUILD, but for arm7 is not.
> Isn't here the problem?
>
>
Yes, you are right. I have checked all the arm start.s. Only arm926ejs
and armv7 has the bss clean in spl build.




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