If the user is using an old Android image (version < 2) there are no special DTB pointers. What systems do in this case is to use the "second" area for a DTB, and this is what bootm is falling back to when booting and abootimg, see image-fdt.c function boot_get_fdt().
So since I need this on some PostmarkeOS systems to modify DTBs on-the-fly, make the abootimg also recognize and fall back to using "second" if the Android image header is < 2.
Cc: Markuss Broks markuss.broks@gmail.com Cc: Stephan Gerhold stephan@gerhold.net Cc: Simon Glass sjg@chromium.org Cc: Sam Protsenko joe.skb7@gmail.com Signed-off-by: Linus Walleij linus.walleij@linaro.org --- cmd/abootimg.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/cmd/abootimg.c b/cmd/abootimg.c index f48a9dcb021d..fd4c102d909f 100644 --- a/cmd/abootimg.c +++ b/cmd/abootimg.c @@ -119,7 +119,19 @@ static int abootimg_get_dtb_by_index(int argc, char *const argv[])
if (!android_image_get_dtb_by_index(abootimg_addr(), num, &addr, &size)) { - return CMD_RET_FAILURE; + /* + * If we are asking for index 0 and have header v1 we fall back + * to getting the FDT from the "second" area. + */ + const struct andr_img_hdr *hdr = (const struct andr_img_hdr *)abootimg_addr(); + ulong tmp; + + if (num == 0 && !android_image_get_second(hdr, &addr, &tmp)) { + size = tmp; + printf("Using FDT in Android image second area for index 0\n"); + } else { + return CMD_RET_FAILURE; + } }
if (argc == 1) {