[U-Boot] [PATCH] ARM: Fix __bss_start and __bss_end in linker scripts

[Tom Rini <trini@ti.com>]

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On 04/08/2013 03:03 PM, Albert ARIBAUD wrote:
> Hi Tom,
> 
> On Fri, 5 Apr 2013 16:23:30 -0400, Tom Rini <trini@ti.com> wrote:
> 
>> On Fri, Apr 05, 2013 at 10:04:02PM +0200, Albert ARIBAUD wrote:
>> 
>>> The two general ideas of my proposal are:
>>> 
>>> 1) to separate testing the image (text,data,rodata,lists) size
>>> on the one hand and the image BSS size on the other hand, and
>>> 
>>> 2) to consider that if a target defines an image max size and a
>>> BSS max size, then the image max size does not include the BSS
>>> size ; and if it defined an image max size but no BSS max size,
>>> then the image max size includes the BSS.
>>> 
>>> The first idea allows boards with disjoint image and BSS to
>>> still check eahc part's size, a thing not feasible with the
>>> current code; the second idea allows fewer changes, but if one
>>> wants CONFIG_SPL_MAX_SIZE to have a strict meaning, we can drop
>>> idea #2 and still keep idea #1.
>> 
>> Make it so, thanks!
> 
> Just a quick heads up: in the little time I could spare this
> week-end, I analyzed the SPL image vs BSS max sizes issue, and the
> following appeared:
> 
> 
> 1. File arch/arm/cpu/u-boot.lds has an ASSERT() regarding SPL even 
> though it is never used for building SPL (tested by replacing the 
> ASSERT() condition by 0 and building all of ARM).
> 
> 2. Several boards use arch/arm/cpu/u-boot-spl.lds, which has an
> ASSERT() wrongly comparing image+BSS size to image-only
> CONFIG_SPL_MAX_SIZE. Fixing the linker file will fix all tegra
> boards as well as the exynos origen and smdkv310.
> 
> Note: the tegra-common.h config file states a non-existent .lds
> file for SPL.

I was wondering about #1 and the tegra bit too, but thought there must
be magic I'm missing.

> 
> 3. Boards cam_enc_4xx, da850evm, smdk5250 and snow all define
> maximum SPL size to include image and BSS. These must be split
> arbitrarily; I have chosen values that fit sizes from current build
> results.

In all of the first two, it's limit on overall size
(text/data/rodata/bss).


- -- 
Tom
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