Am 11. Juli 2025 20:55:12 MESZ schrieb Tom Rini <tr...@konsulko.com>: >As part of upgrading to QEMU 10.0.0 we discovered that the EFI loader >tests would no longer pass CI, on this specific platform, while still >passing on real hardware. Upon further investigation it turns out that >on ARMv7 we rely on some undefined behavior with respect to enabling >unaligned access. And while this is seemingly fine on real hardware, >QEMU is now correct enough in implementation to no longer allow this. In >order to not rely on this undefined behavior we would need to implement >some MMU configuration (and then ensure proper tear-down possibly). > >At the moment, the most reasonable path forward seems to be to document >this and disable the support here.
Where will we document the issue? Does it imply that we should discourage EFI use on all ARMv7 systems? It would be good if somebody at ARM could find out if they ever delivered designs that match QEMU's behavior. Best regards Heinrich > >Link: https://gitlab.com/qemu-project/qemu/-/issues/2944 >Signed-off-by: Tom Rini <tr...@konsulko.com> >--- >I believe at one point Norther was using this platform, in QEMU, for a >reference platform via EFI for using Mender. As such, this would likely >make this platform not useful anymore. I believe Ilias can better >explain what needs to be done to fix this properly but there's no one >with the available time to take care of this in the community at large, >and this is part of what's blocking updating QEMU to a newer version >that provides other platform and feature support we do want to use. >Alternatively, we could just let this platform go and remove it, if that >path makes more sense. > >Cc: Josef Holzmayr <josef.holzm...@northern.tech> >Cc: Heinrich Schuchardt <xypron.g...@gmx.de> >Cc: Ilias Apalodimas <ilias.apalodi...@linaro.org> >--- > configs/vexpress_ca9x4_defconfig | 4 ++++ > 1 file changed, 4 insertions(+) > >diff --git a/configs/vexpress_ca9x4_defconfig >b/configs/vexpress_ca9x4_defconfig >index 67adba437bfc..6ebb37fcf2ec 100644 >--- a/configs/vexpress_ca9x4_defconfig >+++ b/configs/vexpress_ca9x4_defconfig >@@ -13,6 +13,7 @@ CONFIG_DEFAULT_DEVICE_TREE="vexpress-v2p-ca9" > CONFIG_SYS_LOAD_ADDR=0x90000000 > CONFIG_ENV_ADDR=0x47F80000 > CONFIG_SYS_MONITOR_BASE=0x40000000 >+# CONFIG_EFI_LOADER is not set > CONFIG_DISTRO_DEFAULTS=y > CONFIG_BOOTCOMMAND="run distro_bootcmd; run bootflash" > CONFIG_DEFAULT_FDT_FILE="vexpress-v2p-ca9.dtb" >@@ -20,6 +21,7 @@ CONFIG_SYS_CBSIZE=512 > CONFIG_SYS_PBSIZE=532 > # CONFIG_DISPLAY_CPUINFO is not set > # CONFIG_DISPLAY_BOARDINFO is not set >+CONFIG_LAST_STAGE_INIT=y > # CONFIG_CMD_CONSOLE is not set > # CONFIG_CMD_BOOTD is not set > # CONFIG_CMD_XIMG is not set >@@ -55,4 +57,6 @@ CONFIG_SMC911X=y > CONFIG_SMC911X_32_BIT=y > CONFIG_BAUDRATE=38400 > CONFIG_DM_SERIAL=y >+CONFIG_FAT_WRITE=y >+CONFIG_FAT_RENAME=y > CONFIG_SYS_TIMER_COUNTS_DOWN=y
