[PATCH] arm: Enable SYS_THUMB_BUILD on AT91

[Mihai.Sain at microchip.com]

Hi Eugen,

I built new binaries with CONFIG_SYS_THUMB_BUILD=y for sam9x60_curiosity, sama5d29_curiosity, sama7g5ek and new sam9x75_curiosity board.
I used the latest u-boot/master branch for this test.
I noticed that the file size of the binaries have beed reduced with aprox 150KiB due to CONFIG_SYS_THUMB_BUILD=y.
After flashing the new binaries on these boards I can confirm that on all boards the linux kernel was booted properly from mmc, qspi-flash, nand-flash and usb.
I tested using bootm and bootz commands.

Best regards,
Mihai Sain

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On 11/16/23 20:47, Tom Rini wrote:
> On Sat, Nov 04, 2023 at 10:27:42PM -0400, Sean Anderson wrote:
>
>> Several AT91 boards are quite close to their SPL size limit. For 
>> example, sama5d27_wlsom1_ek_mmc is just 173 bytes short of its limit 
>> and doesn't even fit with older GCCs.
>>
>> All AT91 processors should have thumb support. Enable 
>> SYS_THUMB_BUILD. This shrinks SPL by around 30%.
>>
>> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
>> ---
>> This has been BUILD TESTED ONLY!
>
> We in turn need this for Sean's other cleanup series to go in. Is this 
> OK? Would it be safer if it was only for CPU_V7A ? I do have 
> recollections of thumb being sometimes buggy prior to v7a cores. Thanks!
>

Hi Tom,

I would like this to be tested on a few boards at least. There are boards with Cortex A5, A7 and ARM926 which are important, one of each of them and booting Linux should be enough I think.
Nicolas, Aubin ? I remember you guys have also a CI tool that is fairly easy to use if you just push a branch/commit.

+ Mihai as well.

Eugen