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ipq806x: activate ATAG DTB mangle and EA8500 rootblock in dts

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The command-line arguments provided by the boot loader will be
appended to a new device tree property: bootloader-args.
If there is a property "append-rootblock" in DT under /chosen
and a root= option in bootloaders command line it will be parsed
and added to DT bootargs with the form: <append-rootblock>XX.
Only command line ATAG will be processed, the rest of the ATAGs
sent by bootloader will be ignored.
This is usefull in dual boot systems, to get the current root partition
without afecting the rest of the system.

Signed-off-by: Adrian Panella <ianchi74@outlook.com>
This commit is contained in:
Adrian Panella
2016-06-10 19:10:15 -05:00
committed by John Crispin
parent f532191c1c
commit 0ddcbee261
3 changed files with 190 additions and 1 deletions
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target/linux/ipq806x/files/arch/arm/boot/dts/qcom-ipq8064-ea8500.dts
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@@ -29,6 +29,7 @@
chosen {
bootargs = "console=ttyMSM0,115200n8";
linux,stdout-path = "serial0:115200n8";
append-rootblock = "ubi.mtd="; /* append to bootargs adding the root deviceblock nbr from bootloader */
};
soc {