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/kernel | |
| parent | c158c3bf59951bbb44bd7ccca9e6665dfd1617c5 (diff) | |
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/kernel')
| -rw-r--r-- | arch/x86/kernel/early_printk.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/x86/kernel/early_printk.c b/arch/x86/kernel/early_printk.c index d15f575a861b..6d3d20073615 100644 --- a/arch/x86/kernel/early_printk.c +++ b/arch/x86/kernel/early_printk.c @@ -17,6 +17,8 @@ #include <asm/mrst.h> #include <asm/pgtable.h> #include <linux/usb/ehci_def.h> +#include <linux/efi.h> +#include <asm/efi.h> /* Simple VGA output */ #define VGABASE (__ISA_IO_base + 0xb8000) @@ -234,6 +236,11 @@ static int __init setup_early_printk(char *buf) early_console_register(&early_hsu_console, keep); } #endif +#ifdef CONFIG_EARLY_PRINTK_EFI + if (!strncmp(buf, "efi", 3)) + early_console_register(&early_efi_console, keep); +#endif + buf++; } return 0; |