[OpenWrt-Devel] Firmware without SquashFS (initramfs + overlay)

[Rafał Miłecki]

I found this explanation:
http://wiki.openwrt.org/doc/techref/filesystems#can.we.switch.the.filesystem.to.be.entirely.jffs2
but I'm looking for more details.

I wanted to run OpenWrt on bcm53xx using initramfs and flash with
overlay data partition. So I've improved/hacked partitioner driver to
create partitions like this:
[    2.385715] 5 bcm47xxpart partitions found on MTD device spi32766.0
[    2.391982] Creating 5 MTD partitions on "spi32766.0":
[    2.397117] 0x000000000000-0x000000040000 : "boot"
[    2.403742] 0x000000040000-0x000000ff0000 : "firmware"
[    2.410631] 0x00000004001c-0x000000270000 : "linux"
[    2.429738] 0x000000270000-0x000000ff0000 : "rootfs_data"
[    2.436903] 0x000000ff0000-0x000001000000 : "nvram"

I hoped OpenWrt will use initramfs and then will overlay with with
"rootfs_data". Unfortunately it didn't happen, I think "rootfs_data"
was ignored by OpenWrt.

I've then tried to use "rootfs". It was a bit better:
[    2.386053] 5 bcm47xxpart partitions found on MTD device spi32766.0
[    2.392326] Creating 5 MTD partitions on "spi32766.0":
[    2.397457] 0x000000000000-0x000000040000 : "boot"
[    2.404071] 0x000000040000-0x000000ff0000 : "firmware"
[    2.410976] 0x00000004001c-0x000000270000 : "linux"
[    2.430065] 0x000000270000-0x000000ff0000 : "rootfs"
[    2.436823] mtd: device 3 (rootfs) set to be root filesystem
[    2.442752] mtdsplit: no squashfs found in "spi32766.0"
[    2.447975] 0x000000ff0000-0x000001000000 : "nvram"

# mount
rootfs on / type rootfs (rw)
proc on /proc type proc (rw,noatime)
sysfs on /sys type sysfs (rw,noatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev,noatime)
tmpfs on /dev type tmpfs (rw,relatime,size=512k,mode=755)
devpts on /dev/pts type devpts (rw,relatime,mode=600)
debugfs on /sys/kernel/debug type debugfs (rw,noatime)

But none of my changes in / survived the reboot.

Any tips how to fix this?

-- 
Rafał
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