On Thu, Sep 21, 2017 at 10:37:57PM +0300, Sam Protsenko wrote:
Right now on OMAP5-based boards we have only one partition defined for Linux boot, which is rootfs. That doesn't work with bootpart=1:2 (that is defined in include/environment/ti/boot.h). To fix Linux boot we may either:
- Change bootpart to be 1:1
- Or add preceding partition, so that rootfs is actually 1:2
Second choice seems more reasonable, as DFU is already using similar partition table and can rely on bootpart to be 1:2.
This patch adds "bootloader" partition. So now eMMC layout for Linux boot looks like this:
offset content size partition (KiB) (KiB) =======================================================================
0 +--------------------------------+ | MBR/GPT header | 128 - 128 +--------------------------------+ | MLO | 256 - 384 +--------------------------------+ | u-boot.img | 1792 bootloader 2176 +--------------------------------+ | //////////// hole //////////// | 256 - 2432 +--------------------------------+ | U-Boot environment | 128 - 2560 +--------------------------------+ | U-Boot environment (redundant) | 128 - 2688 +--------------------------------+ | rootfs | remaining rootfs end +--------------------------------+
=======================================================================
Guard hole appears because U-Boot environment offset was calculated for Android partition table, which has two additional partitions in place of that hole ("environment" and "misc" partitions).
This patch also changes rootfs offset from 2 MiB further to 2688 KiB, so that there won't be any collisions with U-Boot environment when we flash rootfs.
Signed-off-by: Sam Protsenko semen.protsenko@linaro.org
Reviewed-by: Tom Rini trini@konsulko.com