Forum Discussion

Honored Contributor

19 years ago

How to use jffs2 in flash ?

hi hippo

I can cp -a some dirs to /mnt on uclinux with using initramfs.

In other word, i have build rootfs in my flash(mtdblock0)that can mount it to /mnt dir, and i can see some dirs in /mnt dir.

<div class='quotetop'>QUOTE </div>

--- Quote Start ---

BusyBox v1.1.1-pre0 (2006.04.20-12:52+0000) Built-in shell (msh)

Enter 'help' for a list of built-in commands.

# mount -t jffs2 /dev/mtdblock0 /mnt# cd /mnt# ls -l# mkdir proc sys var tmp mnt# cp -a /init /etc /dev /bin /sbin /usr /root /home /opt .# ls -l

drwxr-xr-x 2 root root 0 Nov 29 17:00 bin

drwxr-xr-x 6 root root 0 Nov 29 17:00 dev

drwxr-xr-x 4 root root 0 Nov 29 17:00 etc

drwxr-xr-x 3 root root 0 Nov 29 17:00 home

lrwxrwxrwx 1 root root 10 Nov 29 17:03 init -> /sbin/init

drwxr-xr-x 2 root root 0 Nov 29 17:01 mnt

drwxr-xr-x 2 root root 0 Nov 29 17:00 opt

drwxr-xr-x 2 root root 0 Nov 29 17:01 proc

drwxr-xr-x 2 root root 0 Nov 29 17:00 root

drwxr-xr-x 2 root root 0 Nov 29 17:00 sbin

drwxr-xr-x 2 root root 0 Nov 29 17:01 sys

drwxr-xr-x 2 root root 0 Nov 29 17:01 tmp

drwxr-xr-x 5 root root 0 Nov 29 17:00 usr

drwxr-xr-x 2 root root 0 Nov 29 17:01 var# cd /# umount /mnt# ls

bin etc init mnt proc sbin tmp var

dev home lib opt root sys usr# [/b]

--- Quote End ---

Check rootfs in mnt dir.

<div class='quotetop'>QUOTE </div>

--- Quote Start ---

BusyBox v1.1.1-pre0 (2006.04.20-12:52+0000) Built-in shell (msh)

Enter 'help' for a list of built-in commands.

# mount -t jffs2 /dev/mtdblock0 /mnt# cd /mnt# ls -l

drwxr-xr-x 2 root root 0 Nov 29 17:00 bin

drwxr-xr-x 6 root root 0 Nov 29 17:00 dev

drwxr-xr-x 4 root root 0 Nov 29 17:00 etc

drwxr-xr-x 3 root root 0 Nov 29 17:00 home

lrwxrwxrwx 1 root root 10 Nov 29 17:03 init -> /sbin/init

drwxr-xr-x 2 root root 0 Nov 29 17:01 mnt

drwxr-xr-x 2 root root 0 Nov 29 17:00 opt

drwxr-xr-x 2 root root 0 Nov 29 17:01 proc

drwxr-xr-x 2 root root 0 Nov 29 17:00 root

drwxr-xr-x 2 root root 0 Nov 29 17:00 sbin

drwxr-xr-x 2 root root 0 Nov 29 17:01 sys

drwxr-xr-x 2 root root 0 Nov 29 17:01 tmp

drwxr-xr-x 5 root root 0 Nov 29 17:00 usr

drwxr-xr-x 2 root root 0 Nov 29 17:01 var# cd /# umount /mnt# [/b]

--- Quote End ---

Q1: How to do that next step ?

Q2: If i want to store some files in flash with using jffs2.

How to do it ?

Can I use "nios2-flash-programmer" command to store files to flash in sdk shell ? or i need to change specific format for programming flash.

Thx !

11 Replies

Altera_Forum
Honored Contributor
19 years ago
A1. You can try root jffs2 now with kernel command string.

A2. You need to use mkfs.jffs2. You may read Jdhar's EPCS guide.
Altera_Forum
Honored Contributor
19 years ago
--- Quote Start ---
originally posted by hippo@Jun 3 2006, 08:14 AM
a1. you can try root jffs2 now with kernel command string.

a2. you need to use mkfs.jffs2. you may read jdhar's epcs guide.
<div align='right'><{post_snapback}> (index.php?act=findpost&pid=15827)
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hi hippo

I meet the same problem again.

This is my processing setps as follows:

1. I don't use initramfs and add "root=/dev/mtdblock0 rw rootfs=jffs2" string in kernel command line.

2. Rebuild kernel to generate new zImage.

3. Download zImage in sdk shell

4. Use "nios2-terminal" command to input uclinux OS.

<div class='quotetop'>QUOTE </div>
--- Quote Start ---
uClinux/Nios II
Altera Nios II support © 2004 Microtronix Datacom Ltd.
Built 1 zonelists
Kernel command line: root=/dev/mtdblock0 rw rootfs=jffs2
PID hash table entries: 64 (order: 6, 1024 bytes)
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory available: 6768k/8192k RAM, 0k/0k ROM (1185k kernel code, 144k data)
Mount-cache hash table entries: 512
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
JFFS2 version 2.2. (NAND) © 2001-2003 Red Hat, Inc.
io scheduler noop registered
io scheduler deadline registered (default)
Serial: JTAG UART driver $Revision: 1.4 $
ttyJ0 at MMIO 0x80481120 (irq = 1) is a jtag_uart
Altera NDK flash (AMD): Found 1 x16 devices at 0x0 in 8-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.
cmdlinepart partition parsing not available
RedBoot partition parsing not available
Using Altera NDK partition definition
Creating 1 MTD partitions on "Altera NDK flash (AMD)":
0x00000000-0x00400000 : "jffs2"
usbmon: debugfs is not available
driver isp1362-hcd, 2005-04-04
isp1362-hcd isp1362-hcd: ISP1362 Host Controller
isp1362_hc_reset:
isp1362-hcd isp1362-hcd: new USB bus registered, assigned bus number 1
isp1362-hcd isp1362-hcd: irq 4, io mem 0x804810d0
isp1362_hc_start:
isp1362-hcd isp1362-hcd: ISP1362 Memory usage:
isp1362-hcd isp1362-hcd: ISTL: 2 * 256: 512 @ $0000:$0100
isp1362-hcd isp1362-hcd: INTL: 16 * ( 64+8): 1152 @ $0200
isp1362-hcd isp1362-hcd: ATL : 32 * ( 64+8): 2304 @ $0680
isp1362-hcd isp1362-hcd: USED/FREE: 3968 128
usb usb1: configuration# 1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ISP1362 Host Controller, irq 4
Initializing USB Mass Storage driver...
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,0)[/b]
--- Quote End ---

How to solve it ?

Thx !
Altera_Forum
Honored Contributor
19 years ago
Please enable mtd debug level 2 or 3 in kernel config.
Altera_Forum
Honored Contributor
19 years ago
--- Quote Start ---
originally posted by hippo@Jun 3 2006, 09:26 AM
please enable mtd debug level 2 or 3 in kernel config.
<div align='right'><{post_snapback}> (index.php?act=findpost&pid=15837)
--- quote end ---

--- Quote End ---

hi hippo

I already enable mtd degug level is 2 in kernel config.

<div class='quotetop'>QUOTE </div>
--- Quote Start ---
uClinux/Nios II
Altera Nios II support © 2004 Microtronix Datacom Ltd.
Built 1 zonelists
Kernel command line: root=/dev/mtdblock0 rw rootfs=jffs2
PID hash table entries: 64 (order: 6, 1024 bytes)
Dentry cache hash table entries: 2048 (order: 1, 8192 bytes)
Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
Memory available: 6768k/8192k RAM, 0k/0k ROM (1186k kernel code, 143k data)
Mount-cache hash table entries: 512
SCSI subsystem initialized
usbcore: registered new driver usbfs
usbcore: registered new driver hub
JFFS2 version 2.2. (NAND) © 2001-2003 Red Hat, Inc.
io scheduler noop registered
io scheduler deadline registered (default)
Serial: JTAG UART driver $Revision: 1.4 $
ttyJ0 at MMIO 0x80481120 (irq = 1) is a jtag_uart
Altera NDK flash (AMD): Found 1 x16 devices at 0x0 in 8-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.
cmdlinepart partition parsing not available
RedBoot partition parsing not available
Using Altera NDK partition definition
Creating 1 MTD partitions on "Altera NDK flash (AMD)":
0x00000000-0x00400000 : "jffs2"
mtd: Giving out device 0 to jffs2
usbmon: debugfs is not available
driver isp1362-hcd, 2005-04-04
isp1362-hcd isp1362-hcd: ISP1362 Host Controller
isp1362_hc_reset:
isp1362-hcd isp1362-hcd: new USB bus registered, assigned bus number 1
isp1362-hcd isp1362-hcd: irq 4, io mem 0x804810d0
isp1362_hc_start:
isp1362-hcd isp1362-hcd: ISP1362 Memory usage:
isp1362-hcd isp1362-hcd: ISTL: 2 * 256: 512 @ $0000:$0100
isp1362-hcd isp1362-hcd: INTL: 16 * ( 64+8): 1152 @ $0200
isp1362-hcd isp1362-hcd: ATL : 32 * ( 64+8): 2304 @ $0680
isp1362-hcd isp1362-hcd: USED/FREE: 3968 128
usb usb1: configuration# 1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
ISP1362 Host Controller, irq 4
Initializing USB Mass Storage driver...
usbcore: registered new driver usb-storage
USB Mass Storage support registered.
mtdblock_open
ok
mtdblock: read on "jffs2" at 0x0, size 0x200
mtdblock_release
ok
mtdblock_open
ok
mtdblock: read on "jffs2" at 0x0, size 0x200
mtdblock_release
ok
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,0)[/b]
--- Quote End ---

Thx !
Altera_Forum
Honored Contributor
19 years ago
It tried to read mtd sector 00 twice. but failed to mount?
Please try mtd debug level 3.

And try to trace into kernel source init/main.c and do_mount .
Altera_Forum
Honored Contributor
19 years ago
--- Quote Start ---
originally posted by hippo@Jun 3 2006, 10:02 AM
it tried to read mtd sector 00 twice. but failed to mount?
please try mtd debug level 3.

and try to trace into kernel source init/main.c and do_mount .
<div align='right'><{post_snapback}> (index.php?act=findpost&pid=15839)
--- quote end ---

--- Quote End ---

hi hippo

I have set mtd debug level is 3 that got the same result again. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/sad.gif

<div class='quotetop'>QUOTE </div>
--- Quote Start ---
USB Mass Storage support registered.
mtdblock_open
ok
mtdblock: read on "jffs2" at 0x0, size 0x200
mtdblock_release
ok
mtdblock_open
ok
mtdblock: read on "jffs2" at 0x0, size 0x200
mtdblock_release
ok
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,0)[/b]
--- Quote End ---

How to do that is croectlly ?

Thx !
Altera_Forum
Honored Contributor
19 years ago
I will trace this problem later when I have spare time.
For now, you can boot with initramfs, and put your user apps and data on jffs2 drive. You can copy them from usb disk to jffs2. Or try mkfs.jffs2.

Root on jffs2 will save only around 300 kB.
Altera_Forum
Honored Contributor
19 years ago
--- Quote Start ---
originally posted by hippo@Jun 3 2006, 09:31 PM
i will trace this problem later when i have spare time.
for now, you can boot with initramfs, and put your user apps and data on jffs2 drive. you can copy them from usb disk to jffs2. or try mkfs.jffs2.

root on jffs2 will save only around 300 kb.
<div align='right'><{post_snapback}> (index.php?act=findpost&pid=15851)
--- quote end ---

--- Quote End ---

hi hippo

Thank you very much !
I have not try to copy files from usb disk to jffs2 drive yet.
but i think that is OK.
Altera_Forum
Honored Contributor
19 years ago
hi hippo

I can copy files from usb compact flash to jffs2 drive(flash) in mnt dir, as following:

<div class='quotetop'>QUOTE </div>
--- Quote Start ---
BusyBox v1.1.1-pre0 (2006.04.20-12:52+0000) Built-in shell (msh)
Enter 'help' for a list of built-in commands.
# usb 1-2: new full speed USB device using isp1362-hcd and address 2
usb 1-2: configuration# 1 chosen from 1 choice
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: eUSB Model: Compact Flash Rev: 5.07
Type: Direct-Access ANSI SCSI revision: 02
SCSI device sda: 250880 512-byte hdwr sectors (128 MB)
sda: Write Protect is off
sda: assuming drive cache: write through
SCSI device sda: 250880 512-byte hdwr sectors (128 MB)
sda: Write Protect is off
sda: assuming drive cache: write through
sda: sda1
sd 0:0:0:0: Attached scsi removable disk sda
# cd /mnt# mkdir usb flash# ls
flash usb# cd /mnt# ls -l
drwxr-xr-x 2 root root 0 Nov 29 17:00 flash
drwxr-xr-x 2 root root 0 Nov 29 17:00 usb# mount -t vfat /dev/sda1 /mnt/usb# mount -t jffs2 /dev/mtdblock0 /mnt/flash# cd /mnt# cd /mnt/usb# ls
Baby.wav Baby1.wav readme.txt# cp readme.txt /mnt/flash# cd /mnt/flash# ls
bin home opt root tmp
dev init proc sbin usr
etc mnt readme.txt sys var# rm readme.txt# ls
bin etc init opt root sys usr
dev home mnt proc sbin tmp var# [/b]
--- Quote End ---
Altera_Forum
Honored Contributor
19 years ago
Good. You don't need the dirs for rootfs in jffs2 now. You can use jffs2 mount all for user data.

Forum Discussion

How to use jffs2 in flash ?

11 Replies

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