kumquat-buildroot/board/cubietech/cubieboard2/genimage.cfg
Alexey Brodkin 0ce3963a62 cubieboard2: Accommodate U-Boot environment on SD-card
According to current "include/configs/sunxi-common.h"
U-Boot environment is stored on SD-card with offset 544 kB
and its size is limited as 128 kB.

Given memory layout of sunxi boards:
  1. SPL
  2. U-Boot
  3. U-Boot environment
  4. Partitions

(see http://linux-sunxi.org/Bootable_SD_card#SD_Card_Layout for details)

we need to make sure the first real partition starts at least
with 544+128 kB offset. Adding a small safety gap let's put
the first partition with offset 1MB from the beginning of SD-card.

Otherwise current setup gets broken as soon as one saves U-Boot
environment with "saveenv" which basically overwrites FAT partition with
zImage and board no longer boots into Linux kernel.

[Peter: extend description, add padding to u-boot partition instead]
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Erico Nunes <nunes.erico@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Peter Korsgaard <peter@korsgaard.com>
Cc: Carlos Quijano <carlos@crqgestion.es>
Cc: Andi Shyti <andi@etezian.org>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2016-07-02 13:19:12 +02:00

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INI

# Minimal SD card image for the Cubieboard2
# Based in the Orange Pi genimage.cfg
image boot.vfat {
vfat {
files = {
"zImage",
"sun7i-a20-cubieboard2.dtb",
"boot.scr"
}
}
size = 10M
}
image sdcard.img {
hdimage {
}
partition u-boot {
in-partition-table = "no"
image = "u-boot-sunxi-with-spl.bin"
offset = 8192
size = 1040384 # 1MB - 8192
}
partition boot {
partition-type = 0xC
bootable = "true"
image = "boot.vfat"
}
partition rootfs {
partition-type = 0x83
image = "rootfs.ext4"
size = 512M
}
}