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fdt: boot_get_fdt: android: use ENV 'fdtaddr' as fallback

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Our platform doesn't store the DTB into the Android image second area,
but rather copies the DTB to RAM from a dedicated dtb.img partition [0],
prior to booting the Android image by calling bootm.

Similar to [1], we find it useful to just call 'bootm' and have the
right DTB being passed to OS (assuming its address has been previously
stored in 'fdtaddr' by calling `fdt addr <dtb-addr>`).

Booting Android with DTB from 'fdtaddr' will only occur if:
 - No DTB is embedded in the second area of Android image
 - 'fdtaddr' points to a valid DTB in RAM

[0] https://source.android.com/devices/architecture/dto/partitions
[1] https://patchwork.ozlabs.org/patch/1046652/
    ("Support boot Android image without address on bootm command")

Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Eugeniu Rosca 2019-04-01 12:52:52 +02:00 committed by Simon Glass
parent 18b8f2c49e
commit 62392675cd
1 changed files with 9 additions and 1 deletions
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10
common/image-fdt.c
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@ -469,7 +469,15 @@ int boot_get_fdt(int flag, int argc, char * const argv[], uint8_t arch,
debug("## Using FDT in Android image second area\n");
} else {
goto no_fdt;
fdt_addr = env_get_hex("fdtaddr", 0);
if (!fdt_addr)
goto no_fdt;
fdt_blob = map_sysmem(fdt_addr, 0);
if (fdt_check_header(fdt_blob))
goto no_fdt;
debug("## Using FDT at ${fdtaddr}=Ox%lx\n", fdt_addr);
}
#endif
} else {