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Diffstat (limited to 'gitlab/issues_text/target_arm/host_missing/accel_missing/2916')
| -rw-r--r-- | gitlab/issues_text/target_arm/host_missing/accel_missing/2916 | 26 |
1 files changed, 0 insertions, 26 deletions
diff --git a/gitlab/issues_text/target_arm/host_missing/accel_missing/2916 b/gitlab/issues_text/target_arm/host_missing/accel_missing/2916 deleted file mode 100644 index 92a0df13d..000000000 --- a/gitlab/issues_text/target_arm/host_missing/accel_missing/2916 +++ /dev/null @@ -1,26 +0,0 @@ -qemu-system-arm hangs when attempting to enable MMU on Cortex-A7 -Description of problem: -QEMU 9.x.x+ hangs when attempting to do enable the MMU from SCTLRL - M bit: https://developer.arm.com/documentation/ddi0601/2025-03/AArch32-Registers/SCTLR--System-Control-Register - -The instruction that hangs is the writing of the SCTLR register: - -``` -mrc p15, 0, r0, c1, c0, 0 -orr r0, r0, 1 -mcr p15, 0, r0, c1, c0, 0 -``` - -I am attempting to enable unaligned accesses and SCTLR-A bit doesn't seem to have any effect if the SCTLR-M is not enabled. Doing an unaligned access on cortex-a7 should be supported but it always trigger a Fault. -Steps to reproduce: -1. add the mrc/orr/mcr instruction sequence in the ResetHandler -2. link the elf -3. attempt to execute it -Additional information: -The unaligned access looked like it was working in QEMU 8.x.x but it might not have been emulated(?). I also am facing the same issues with MCR hanging and unaligned access not supported with latest 10.0.0-RC2. - -When it hangs, QEMU has to be killed and terminal reset. - -There might be two separate issues here: - -1. writing SCTLR register -2. emulated cortex-a7 not supporting unaligned access (hardware supports it) |