On Thu, Jan 14, 2016 at 11:35:39AM -0700, Stephen Warren wrote:
On 01/14/2016 06:20 AM, Tom Rini wrote:
On Wed, Nov 25, 2015 at 05:56:33PM +0100, Albert ARIBAUD wrote:
As of gcc 5.2.1 for Thumb-1, it is not possible any more to assign gd from C code, as gd is mapped to r9, and r9 may now be saved in the prolog sequence, and restored in the epilog sequence, of any C functions.
Therefore arch_setup_gd(), which is supposed to set r9, may actually have no effect, causing U-Boot to use a bad address to access GD.
Fix this by never calling arch_setup_gd() for ARM, and instead setting r9 in arch/arm/lib/crt0.S, to the value returned by board_init_f_alloc_reserve().
Signed-off-by: Albert ARIBAUD albert.u.boot@aribaud.net Reviewed-by: Simon Glass sjg@chromium.org
Applied to u-boot/master, thanks!
FYI, this commit causes U-Boot to fail (crash or hang during very early startup with zero UART output) on at least an NVIDIA Jetson TX1 (p2371-2180) board. Reverting just this in u-boot/master solves the issue. I have not tested other boards or looked at the code itself yet.
Is that one of the systems where we have an ARM9 and then a Cortex-A? FWIW, my pandaboard is up in Fedora currently. I'm trying to do some boot testing on what I have more often and then a bigger round of unboxing and testing at -rc1/release time.
(As an interesting datapoint, this is the first issue caught by the Jenkins system I'm setting up to run test/py on a few Tegra boards)
Yay for that at least.