diff options
| author |   Matt Fleming <matt.fleming@intel.com> | 2013-10-04 09:36:56 +0100 |
|---|---|---|
| committer | Matt Fleming <matt.fleming@intel.com> | 2013-10-28 18:09:58 +0000 |
| commit | 72548e836b0c4abbb652e791dee9c91203a9a4c6 (patch) | |
| tree | 2eead15738f173ed08ecbedc88adbb0bf2937022 /arch/x86/Kconfig.debug | |
| parent | boot, efi: Remove redundant memset() (diff) | |
| download | linux-dev-72548e836b0c4abbb652e791dee9c91203a9a4c6.tar.xz linux-dev-72548e836b0c4abbb652e791dee9c91203a9a4c6.zip | |
x86/efi: Add EFI framebuffer earlyprintk support
It's incredibly difficult to diagnose early EFI boot issues without
special hardware because earlyprintk=vga doesn't work on EFI systems.
Add support for writing to the EFI framebuffer, via earlyprintk=efi,
which will actually give users a chance of providing debug output.
Cc: H. Peter Anvin <hpa@zytor.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Jones <pjones@redhat.com>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'arch/x86/Kconfig.debug')
| -rw-r--r-- | arch/x86/Kconfig.debug | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug index 78d91afb8e50..0f3621ed1db6 100644 --- a/arch/x86/Kconfig.debug +++ b/arch/x86/Kconfig.debug @@ -59,6 +59,16 @@ config EARLY_PRINTK_DBGP with klogd/syslogd or the X server. You should normally N here, unless you want to debug such a crash. You need usb debug device. +config EARLY_PRINTK_EFI + bool "Early printk via the EFI framebuffer" + depends on EFI && EARLY_PRINTK + select FONT_SUPPORT + ---help--- + Write kernel log output directly into the EFI framebuffer. + + This is useful for kernel debugging when your machine crashes very + early before the console code is initialized. + config X86_PTDUMP bool "Export kernel pagetable layout to userspace via debugfs" depends on DEBUG_KERNEL |