generic: mtdsplit: fit: improve detecting external-data FIT

Currently the detection of external-data FIT images works by checking
if the FIT structure is more than 4 kiB. However, for boards with lots
of different DT-overlays and configurations the FIT structure can
exceed 4 kiB which results in the FIT splitter to fail detecting the
rootfs.
Increase the threshold for external-data FIT to 512 kiB as there aren't
any kernel images smaller than that, and FIT structure less than 512 kiB
will always be an external-data FIT.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

diff --git a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c
index a271a676e10e101fb8d4c2092176657229be4986..29d26f4057179d4dc3187491a56bf34883588099 100644 (file)
--- a/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c
+++ b/target/linux/generic/files/drivers/mtd/mtdsplit/mtdsplit_fit.c
@@ -258,7 +258,7 @@ mtdsplit_fit_parse(struct mtd_info *mtd,
         * hence we need to parse FDT structure to find the end of the
         * last external data refernced.
         */
-       if (fit_size > 0x1000) {
+       if (fit_size > 0x80000) {
                enum mtdsplit_part_type type;
 
                /* Search for the rootfs partition after the FIT image */