diff options
| author | Atish Patra <atish.patra@wdc.com> | 2020-03-05 16:24:23 -0800 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2020-04-17 12:32:36 -0400 |
| commit | 414c34ed555b8ce5c260cf641261ecf45beca251 (patch) | |
| tree | 9c61e50fe37396b9c1800003f0a14f13d4cad27b /doc/README.distro | |
| parent | 155d6a3575470c1a735b8cf368d9e987930910a8 (diff) | |
| download | u-boot-414c34ed555b8ce5c260cf641261ecf45beca251.tar.gz | |
image: Add compressed Image parsing support in booti.
Add compressed Image parsing support so that booti can parse both
flat and compressed Image to boot Linux. Currently, it is difficult
to calculate a safe address for every board where the compressed
image can be decompressed. It is also not possible to figure out the
size of the compressed file as well. Thus, user need to set two
additional environment variables kernel_comp_addr_r and filesize to
make this work.
Following compression methods are supported for now.
lzma, lzo, bzip2, gzip.
lz4 support is not added as ARM64 kernel generates a lz4 compressed
image with legacy header which U-Boot doesn't know how to parse and
decompress.
Tested on HiFive Unleashed and Qemu for RISC-V.
Tested on Qemu for ARM64.
Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
[trini: Fix minor rST formatting problems]
Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'doc/README.distro')
| -rw-r--r-- | doc/README.distro | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/doc/README.distro b/doc/README.distro index ab6e6f4e74..5076bebd18 100644 --- a/doc/README.distro +++ b/doc/README.distro @@ -246,6 +246,18 @@ kernel_addr_r: A size of 16MB for the kernel is likely adequate. +kernel_comp_addr_r: + Optional. This is only required if user wants to boot Linux from a compressed + Image(.gz, .bz2, .lzma, .lzo) using booti command. It represents the location + in RAM where the compressed Image will be decompressed temporarily. Once the + decompression is complete, decompressed data will be moved kernel_addr_r for + booting. + +kernel_comp_size: + Optional. This is only required if user wants to boot Linux from a compressed + Image using booti command. It represents the size of the compressed file. The + size has to at least the size of loaded image for decompression to succeed. + pxefile_addr_r: Mandatory. The location in RAM where extlinux.conf will be loaded to prior |