ref-manual: variables: FIT_KERNEL_COMP_ALG: add lzo

OE-Core rev f1257d61b76d027d4ece734439993b6bf4e48907 introduced support
for using lzo as compression algorithm for fitImage contained kernel
images.
This patch adds the corresponding documentation to FIT_KERNEL_COMP_ALG
and FIT_KERNEL_COMP_ALG_EXTENSION.

(From yocto-docs rev: aba0ab326ea72ff10492e73b452b51d1beaa50d6)

Signed-off-by: Richard Leitner <dev@g0hl1n.net>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 3 insertions, 2 deletions

diff --git a/documentation/ref-manual/variables.rst b/documentation/ref-manual/variables.rst
index 725f5c54cc..edc3aa6523 100644
--- a/documentation/ref-manual/variables.rst
+++ b/documentation/ref-manual/variables.rst
@@ -2892,13 +2892,14 @@ system and gives an overview of their function and contents.
 
    :term:`FIT_KERNEL_COMP_ALG`
       Compression algorithm to use for the kernel image inside the FIT Image.
-      At present, the only supported values are "gzip" (default) or "none"
+      At present, the only supported values are "gzip" (default), "lzo" or "none".
       If you set this variable to anything other than "none" you may also need
       to set :term:`FIT_KERNEL_COMP_ALG_EXTENSION`.
 
    :term:`FIT_KERNEL_COMP_ALG_EXTENSION`
       File extension corresponding to :term:`FIT_KERNEL_COMP_ALG`. The default
-      value is ".gz".
+      value is ".gz". If you set :term:`FIT_KERNEL_COMP_ALG` to "lzo",
+      you may want to set this variable to ".lzo".
 
    :term:`FIT_KEY_GENRSA_ARGS`
       Arguments to openssl genrsa for generating RSA private key for signing