diff options
| author | Ingo Molnar <mingo@kernel.org> | 2013-10-29 09:21:37 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-29 09:21:37 +0100 |
| commit | 88392e9dd5a524b8194f1045369c7d0eb16d9f32 (patch) | |
| tree | 2eead15738f173ed08ecbedc88adbb0bf2937022 /Documentation/kernel-parameters.txt | |
| parent | 564c39701c8c52f2310a425223a04d175ed287c4 (diff) | |
| parent | 72548e836b0c4abbb652e791dee9c91203a9a4c6 (diff) | |
Merge tag 'efi-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mfleming/efi into x86/efi
Pull EFI earlyprintk support from Matt Fleming:
" * Add support for earlyprintk=efi which uses the EFI framebuffer. Very
useful for debugging boot issues. "
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'Documentation/kernel-parameters.txt')
| -rw-r--r-- | Documentation/kernel-parameters.txt | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 7f9d4f53882c..7a0f202d482e 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -792,6 +792,7 @@ bytes respectively. Such letter suffixes can also be entirely omitted. earlyprintk= [X86,SH,BLACKFIN,ARM] earlyprintk=vga + earlyprintk=efi earlyprintk=xen earlyprintk=serial[,ttySn[,baudrate]] earlyprintk=serial[,0x...[,baudrate]] @@ -805,7 +806,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. Append ",keep" to not disable it when the real console takes over. - Only vga or serial or usb debug port at a time. + Only one of vga, efi, serial, or usb debug port can + be used at a time. Currently only ttyS0 and ttyS1 may be specified by name. Other I/O ports may be explicitly specified @@ -819,8 +821,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted. Interaction with the standard serial driver is not very good. - The VGA output is eventually overwritten by the real - console. + The VGA and EFI output is eventually overwritten by + the real console. The xen output can only be used by Xen PV guests. |