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mounting jffs2 rw

DISCUSSION Thomas Brinker 1 participant 2 messages Feb 22, 2005 – Feb 24, 2005 Memory technology devices (MTD)

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Thomas Brinker

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#0 lore raw

Hi!

I have problems in remounting a jffs2 as read/writeable.

Currently it mounts successfully as root-fs but in ro, which is no wonder. But how can I change it to rw?

Here is what I have tried so far:
---===---

# cat /proc/version
Linux version 2.6.9-uc0 (thomas@mobile) (gcc version 3.4.3) #141 Mon Feb 21 16:01:36 CET 2005
# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00400000 00010000 "phys_mapped_flash"
# ls -l /dev/mtd*
crw-r--r--    1 root     root      90,   0 Feb  7  2005 /dev/mtd0
brw-r--r--    1 root     root      31,   0 Feb  7  2005 /dev/mtdblock0
crw-r--r--    1 root     root      90,   1 Feb  7  2005 /dev/mtdr0
# mount
/dev/rom0 on / type jffs2 (ro,noatime)                [<--- rom0 is strange]
/proc on /proc type proc (rw,nodiratime)
none on /dev/pts type devpts (rw)
none on /sys type sysfs (rw)
ram on /var type ramfs (rw)
# mount -o remount,rw /dev/mtdblock0 /
mount: Mounting /dev/mtdblock0 on / failed: No such file or directory
# mount -o remount,rw /dev/rom0 /
mount: Mounting /dev/rom0 on / failed: No such file or directory
# mount -o remount,rw /
mount:
Cannot read /etc/fstab: No such file or directory
---===---

Boot logs:
---===---
Linux version 2.6.9-uc0 (thomas@mobile) (gcc version 3.4.3) #141 Mon Feb 21 16:01:36 CET 2005
CPU: P2001 [41029000] revision 0 (ARMv4T)
Machine: P2001
Built 1 zonelists
Kernel command line: ip=dhcp root=/dev/mtdblock0 rootfstype=jffs2 console=ttyS0,57600n8 PID hash table entries: 128 (order: 7, 2048 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 16MB = 16MB total
Memory: 14508KB available (1440K code, 184K data, 64K init)
Mount-cache hash table entries: 512 (order: 0, 4096 bytes)
NET: Registered protocol family 16
NetWinder Floating Point Emulator V0.97 (extended precision)
JFFS2 version 2.2. (C) 2001-2003 Red Hat, Inc.
JFFS2: default compression mode: priority
p2001_uart.c:v1.3 12/01/2004 Tobias Lorenz ([email protected])
ttyS0 at MMIO 0x140000 (irq = 1) is a P2001
p2001_eth.c:v1.19 12/17/2004 Tobias Lorenz ([email protected])
eth0: ADDR 0x180000, IRQ 17/18, MAC 00:09:4f:00:00:02.
eth0: PHY 0, ID 0x78e20013 (Intel LXT971A).
Setting PHY LEDs to:
Red = Link Status
Yellow = Transmit Status
Green = Receive Status
eth1: ADDR 0x181000, IRQ 19/20, MAC 00:09:4f:00:00:03.
eth1: PHY 1, ID 0x78e20013 (Intel LXT971A).
Setting PHY LEDs to:
Red = Link Status
Yellow = Transmit Status
Green = Receive Status
eth2: no more MII PHYs found
p2001_eth: 2 interfaces found.
Using anticipatory io scheduler
physmap flash device: 400000 at 2000000
phys_mapped_flash: Found 1 x16 devices at 0x0 in 16-bit bank
Amd/Fujitsu Extended Query Table at 0x0040
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
NET: Registered protocol family 2
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 1024 bind 2048)
NET: Registered protocol family 1
NET: Registered protocol family 17
eth0: Receiving filtered multicast (0 entries).
eth0: Receiving filtered multicast (0 entries).
eth0: Receiving filtered multicast (0 entries).
eth1: Receiving filtered multicast (0 entries).
eth1: Receiving filtered multicast (0 entries).
eth1: Receiving filtered multicast (0 entries).
Sending DHCP requests ., OK
IP-Config: Got DHCP answer from 10.0.0.1, my address is 10.0.0.205
eth1: Receiving filtered multicast (0 entries).
eth0: Receiving filtered multicast (1 entries).
IP-Config: Complete:

      device=eth0, addr=10.0.0.205, mask=255.255.255.0, gw=255.255.255.255,
     host=p2001, domain=, nis-domain=(none),
     bootserver=10.0.0.1, rootserver=10.0.0.1, rootpath=/root/linux/armroot

VFS: Mounted root (jffs2 filesystem) readonly. Freeing init memory: 64K
init: Mounting Filesystems: proc devpts sys ram done.
init: Setting up Interfaces: lo done.
init: Starting Services: inetd done.
---===---

Regards
Thomas

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«Kurt Marti»
author
#1 lore raw

Am Dienstag, 22. Februar 2005 12:19 schrieb Thomas Brinker:

Quoted 10 lines

Hi!

I have problems in remounting a jffs2 as read/writeable.

Currently it mounts successfully as root-fs but in ro, which is no wonder. But how can I change it to rw?

Here is what I have tried so far:
---===---

Quoted 11 lines
# cat /proc/version
Linux version 2.6.9-uc0 (thomas@mobile) (gcc version 3.4.3) #141 Mon Feb 21
16:01:36 CET 2005 # cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00400000 00010000 "phys_mapped_flash"
# ls -l /dev/mtd*
crw-r--r--    1 root     root      90,   0 Feb  7  2005 /dev/mtd0
brw-r--r--    1 root     root      31,   0 Feb  7  2005 /dev/mtdblock0
crw-r--r--    1 root     root      90,   1 Feb  7  2005 /dev/mtdr0
# mount
/dev/rom0 on / type jffs2 (ro,noatime)                [<--- rom0 is strange]
# ls -l rom0
brw-r--r--    1 root     root      31,   0 Feb 22  2005 rom0
# ls -l mtdblock0
brw-r--r--    1 root     root      31,   0 Feb 22  2005 mtdblock0
Quoted 9 lines

/proc on /proc type proc (rw,nodiratime)
none on /dev/pts type devpts (rw)
none on /sys type sysfs (rw)
ram on /var type ramfs (rw)

# mount -o remount,rw /dev/mtdblock0 /
mount: Mounting /dev/mtdblock0 on / failed: No such file or directory
# mount -o remount,rw /dev/rom0 /
mount: Mounting /dev/rom0 on / failed: No such file or directory
# mount -o remount,rw /

Adding 'rw' to the kernel command line solves the problem.

Regards
Thomas