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author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-15 22:58:58 +0300 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-07-15 22:58:58 +0300 |
commit | 486088bc4689f826b80aa317b45ac9e42e8b25ee (patch) | |
tree | adf5847a6119d24da990d9e336f005c4a316e6be /Documentation/efi-stub.txt | |
parent | 52f6c588c77b76d548201470c2a28263a41b462b (diff) | |
parent | 43e5f7e1fa66531777c49791014c3124ea9208d8 (diff) | |
download | linux-486088bc4689f826b80aa317b45ac9e42e8b25ee.tar.xz |
Merge tag 'standardize-docs' of git://git.lwn.net/linux
Pull documentation format standardization from Jonathan Corbet:
"This series converts a number of top-level documents to the RST format
without incorporating them into the Sphinx tree. The hope is to bring
some uniformity to kernel documentation and, perhaps more importantly,
have our existing docs serve as an example of the desired formatting
for those that will be added later.
Mauro has gone through and fixed up a lot of top-level documentation
files to make them conform to the RST format, but without moving or
renaming them in any way. This will help when we incorporate the ones
we want to keep into the Sphinx doctree, but the real purpose is to
bring a bit of uniformity to our documentation and let the top-level
docs serve as examples for those writing new ones"
* tag 'standardize-docs' of git://git.lwn.net/linux: (84 commits)
docs: kprobes.txt: Fix whitespacing
tee.txt: standardize document format
cgroup-v2.txt: standardize document format
dell_rbu.txt: standardize document format
zorro.txt: standardize document format
xz.txt: standardize document format
xillybus.txt: standardize document format
vfio.txt: standardize document format
vfio-mediated-device.txt: standardize document format
unaligned-memory-access.txt: standardize document format
this_cpu_ops.txt: standardize document format
svga.txt: standardize document format
static-keys.txt: standardize document format
smsc_ece1099.txt: standardize document format
SM501.txt: standardize document format
siphash.txt: standardize document format
sgi-ioc4.txt: standardize document format
SAK.txt: standardize document format
rpmsg.txt: standardize document format
robust-futexes.txt: standardize document format
...
Diffstat (limited to 'Documentation/efi-stub.txt')
-rw-r--r-- | Documentation/efi-stub.txt | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/Documentation/efi-stub.txt b/Documentation/efi-stub.txt index e15746988261..41df801f9a50 100644 --- a/Documentation/efi-stub.txt +++ b/Documentation/efi-stub.txt @@ -1,5 +1,6 @@ - The EFI Boot Stub - --------------------------- +================= +The EFI Boot Stub +================= On the x86 and ARM platforms, a kernel zImage/bzImage can masquerade as a PE/COFF image, thereby convincing EFI firmware loaders to load @@ -25,7 +26,8 @@ a certain sense it *IS* the boot loader. The EFI boot stub is enabled with the CONFIG_EFI_STUB kernel option. -**** How to install bzImage.efi +How to install bzImage.efi +-------------------------- The bzImage located in arch/x86/boot/bzImage must be copied to the EFI System Partition (ESP) and renamed with the extension ".efi". Without @@ -37,14 +39,16 @@ may not need to be renamed. Similarly for arm64, arch/arm64/boot/Image should be copied but not necessarily renamed. -**** Passing kernel parameters from the EFI shell +Passing kernel parameters from the EFI shell +-------------------------------------------- -Arguments to the kernel can be passed after bzImage.efi, e.g. +Arguments to the kernel can be passed after bzImage.efi, e.g.:: fs0:> bzImage.efi console=ttyS0 root=/dev/sda4 -**** The "initrd=" option +The "initrd=" option +-------------------- Like most boot loaders, the EFI stub allows the user to specify multiple initrd files using the "initrd=" option. This is the only EFI @@ -54,9 +58,9 @@ kernel when it boots. The path to the initrd file must be an absolute path from the beginning of the ESP, relative path names do not work. Also, the path is an EFI-style path and directory elements must be separated with -backslashes (\). For example, given the following directory layout, +backslashes (\). For example, given the following directory layout:: -fs0:> + fs0:> Kernels\ bzImage.efi initrd-large.img @@ -66,7 +70,7 @@ fs0:> initrd-medium.img to boot with the initrd-large.img file if the current working -directory is fs0:\Kernels, the following command must be used, +directory is fs0:\Kernels, the following command must be used:: fs0:\Kernels> bzImage.efi initrd=\Kernels\initrd-large.img @@ -76,7 +80,8 @@ which understands relative paths, whereas the rest of the command line is passed to bzImage.efi. -**** The "dtb=" option +The "dtb=" option +----------------- For the ARM and arm64 architectures, we also need to be able to provide a device tree to the kernel. This is done with the "dtb=" command line option, |