On Sun, Aug 21, 2022 at 04:34:20PM +0300, Sergei Antonov wrote:
There is currently a problem that U-Boot can not work on ARMv4 because assembly imlementations of memcpy() and some other functions use "bx lr" instruction that is not available on ARMv4 ("mov pc, lr" should be used instead).
A working preprocessor-based solution to this problem is found in arch/arm/lib/relocate.S. Move it to the "ret" macro in arch/arm/include/asm/assembler.h and change all "bx lr" code to "ret lr" in functions that may run on ARMv4. Linux source code deals with this problem in the same manner.
v1 -> v2: Comment update. Pointed out by Andre Przywara.
Signed-off-by: Sergei Antonov saproj@gmail.com CC: Samuel Holland samuel@sholland.org CC: Ye Li ye.li@nxp.com CC: Simon Glass sjg@chromium.org CC: Andre Przywara andre.przywara@arm.com CC: Marek Vasut marex@denx.de CC: Sean Anderson sean.anderson@seco.com CC: Tom Rini trini@konsulko.com
Applied to u-boot/next, thanks!