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cmd: pxe: add support for FIT config selection

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Add a way in configuration files (exlinux.conf for sysboot command)
to select a specific FIT configuration. The configuration is selected
with a string added after the FIT filename in the label "KERNEL" or
"LINUX", using the same format than bootm command:

KERNEL [Filename]#<conf>[#<extra-conf[#...]]

This configuration string, beginning by '#', is directly appended
to bootm argument 1 after <kernel_addr_r>.

bootm [<kernel_addr_r>]#<conf>[#<extra-conf[#...]]

see doc/uImage.FIT/command_syntax_extensions.txt for details

Example :
 KERNEL /fit.itb#cfg1
 KERNEL /fit.itb#cfg2

Configuration can be use also for overlay management :
 KERNEL /fit.itb#cfg1#dtbo1#dtbo3

see doc/uImage.FIT/overlay-fdt-boot.txt for details

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
This commit is contained in:
Patrick Delaunay
2018-10-02 10:54:48 +02:00
committed by Tom Rini
parent c45414b542
commit 2023000aed
2 changed files with 58 additions and 3 deletions
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7
doc/README.pxe
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@@ -140,6 +140,13 @@ kernel <path> - if this label is chosen, use tftp to retrieve the kernel
(or FIT image) at <path>. it will be stored at the address
indicated in the kernel_addr_r environment variable, and
that address will be passed to bootm to boot this kernel.
For FIT image, The configuration specification can be
appended to the file name, with the format:
<path>#<conf>[#<extra-conf[#...]]
It will passed to bootm with that address.
(see: doc/uImage.FIT/command_syntax_extensions.txt)
It useful for overlay selection in pxe file
(see: doc/uImage.FIT/overlay-fdt-boot.txt)
append <string> - use <string> as the kernel command line when booting this
label.