Hello, Dear Everyone!
I'm trying to update firmware on my own board (MX28+NAND+OpenWrt). My partition is:
| | mtd0 | mtd1 | mtd2 | mtd3 | mtd4 |
| MTD | uboot | uboot_env | fdt | kernel | root |
| Size | 3M | 256k | 128k | 5M | - |
| UBI | | | | | roofs | rootfs_data |
| Size | | | | | 40M | - |
My bootcmd:
nand read 0x41000000 fdt ${filesize_fdt};
nand read 0x42000000 kernel ${filesize_kernel};
bootm 0x42000000 - 0x41000000
My bootargs:
console=ttyAPP4,115200 rootfstype=ubifs ubi.mtd=4 root=ubi0:rootfs rw mtdparts=gpmi-nand:3m(bootloader)ro,256k(environment),128k(fdt),5m(kernel),-(root)
I can update my system succesfully with U-Boot:
tftp 0x42000000 my_board.dtb ; /* Device Tree */
nand erase.part fdt ;
nand write 0x42000000 fdt ${filesize} ;
tftp 0x42000000 openwrt-mxs-uImage ; /* Kernel */
nand erase.part kernel ;
nand write 0x42000000 kernel ${filesize} ;
tftp 0x42000000 rootfs.ubifs ; /* UBIFS rootfs Image */
nand erase.part root ;
ubi part root ;
ubi create rootfs 0x2A00000 ;
ubi create rootfs_data ;
ubi write 0x42000000 rootfs ${filesize} ;
But I want to update the system on working Linux. I've read about sysupgrade and found that it doesn't support automatic upgrade.
So I'm trying to create a simple updating script. First of all, sysupgrade script was cutted to few functions:
#!/bin/sh
. /lib/functions.sh
. /lib/functions/system.sh
mkdir /tmp/root
kill_remaining TERM
sleep 3
kill_remaining KILL
v "Switching to ramdisk..."
run_ramfs
It works correctly, and I can switch to RAM.
Next step is updating volumes. fdt and kernel was updated correctly with mtd erase/write. But when I try to rewrite ubi0_0 (rootfs), I see:
@TestTest:/# ubiupdatevol dev/ubi0_0 /tmp/root/rootfs.ubifs
[ 853.082273] UBI error: ubi_open_volume: cannot open device 0, volume 0, error -16
ubiupdatevol: can't open 'dev/ubi0_0': Device or resource busy
What's next? Can you help me with this issue?
Thanks in advance,
Vladimir
