diff options
| author | Tom Rini <trini@konsulko.com> | 2025-04-03 11:43:38 -0600 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2025-04-03 11:43:38 -0600 |
| commit | 1f2a3d066c99f57675162ce09586e9de30407f1b (patch) | |
| tree | 40bfceab01cc1c6a035eb66792638149400db1ef /arch/x86/lib/bios_interrupts.c | |
| parent | 39ff722b3ee0bd569388a3b89c59899511ac1a24 (diff) | |
| parent | a3d255d996b346c527962926ff80343e02ae8f00 (diff) | |
Merge patch series "x86: Improve operation under QEMU"
Simon Glass <sjg@chromium.org> says:
U-Boot can start and boot an OS in both qemu-x86 and qemu-x86_64 but it
is not perfect.
With both builds, executing the VESA ROM causes an intermittent hang, at
least on some AMD CPUs.
With qemu-x86_64 kvm cannot be used since the move to long mode (64-bit)
is done in a way that works on real hardware but not with QEMU. This
means that performance is 4-5x slower than it could be, at least on my
CPU.
We can work around the first problem by using Bochs, which is anyway a
better choice than VESA for QEMU. The second can be addressed by using
the same descriptor across the jump to long mode.
With an MTRR fix this allows booting into Ubuntu on qemu-x86_64
In v3 some e820 patches are included to make booting reliable and avoid
ACPI tables being dropped. Also, several MTTR problems are addressed, to
support memory sizes above 4GB reliably.
Link: https://lore.kernel.org/all/20250315142643.2600605-1-sjg@chromium.org/
Diffstat (limited to 'arch/x86/lib/bios_interrupts.c')
| -rw-r--r-- | arch/x86/lib/bios_interrupts.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/arch/x86/lib/bios_interrupts.c b/arch/x86/lib/bios_interrupts.c index b2cf1527b1c..e0c2284a901 100644 --- a/arch/x86/lib/bios_interrupts.c +++ b/arch/x86/lib/bios_interrupts.c @@ -7,6 +7,8 @@ * Copyright (C) 2007-2009 coresystems GmbH */ +#define LOG_CATEGRORY LOGC_ARCH + #include <log.h> #include <asm/pci.h> #include "bios_emul.h" @@ -198,10 +200,8 @@ int int1a_handler(void) dm_pci_write_config32(dev, reg, dword); break; } -#ifdef CONFIG_REALMODE_DEBUG - debug("0x%x: bus %d devfn 0x%x reg 0x%x val 0x%x\n", func, - bus, devfn, reg, M.x86.R_ECX); -#endif + log_debug("0x%x: bus %d devfn 0x%x reg 0x%x val 0x%x\n", func, + bus, devfn, reg, M.x86.R_ECX); M.x86.R_EAX &= 0xffff00ff; /* Clear AH */ M.x86.R_EAX |= PCIBIOS_SUCCESSFUL; retval = 1; |