[U-Boot] [PATCH v2] arm: build arch memset/memcpy in Thumb2 mode

[Stefan Agner]

Hi Andreas,

On 2014-12-15 15:24, Andreas Färber wrote:
> Hi Stefan,
> 
> Am 03.12.2014 um 18:04 schrieb Stefan Agner:
>> Can this be fixed by the merger or should I create a new revision?
> 
> It looks as if this was neither applied nor respun? I have some more
> patches to make CONFIG_USE_PRIVATE_LIBGCC build for Thumb that I would
> like to rebase on it.

Not sure what the expectation is... Probably I should just do a respin
since there are now three minor nits...

> 
> In particular, I have pieced together a tiny asm/unified.h file with
> THUMB() and ARM() macros and doing the .syntax unified in that central
> place, and resyncing the various arch/arm/lib/_*.S files from Linux.
> https://github.com/afaerber/u-boot/commits/stm32
> 
> Is there a particular reason you are doing the .syntax inline here?

No particular reason other than laziness :-)

> 
> And looking beyond this patch, assuming this is for your Vybrid's M4, do
> you already have a concept for how to go about vectors.S, start.S and
> the like for ARMv7-M? :) I've stubbed them out for now but haven't
> managed to successfully link yet...

Actually no, I don't use U-Boot on the M4 (so far). For Linux on the
Vybrid M4, I use a special boot loader which runs on the A5 Linux. On
Vybrid (the variant we use at least) boots always from the A5 first,
hence I have a running Linux. Or alternatively, I could run the M4 from
U-Boot running on the A5. So far, I had no need to run U-Boot on the M4.

The reason I was interested in Thumb2 was the size: Due to lack of 5V on
the Colibri module we need to load the boot loader using Vybrid's serial
loader over UART which is somewhat slow. So the 25% reduction of size
means 25% less download time...

--
Stefan