Can I update and save file when n2linux running?

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originally posted by hippo@Jul 27 2006, 09:57 AM

you may try jffs2 on cfi flash or epcs.

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17195)

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Thanks reply.

Can you give me some hint to help me try jffs2 on cfi flash? I want to use the kernel version is 2.6.x .I can&#39;t open the web

Check the very nice guide from Jdhar,

http://via.dynalias.org/svn/uclinux/doc/trunk/epcs-ug.pdf (http://via.dynalias.org/svn/uclinux/doc/trunk/epcs-ug.pdf)

who can post the pdf to me use email ?

Thanks a lot.

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originally posted by alex824+jul 28 2006, 11:21 am--><div class='quotetop'>quote (alex824 @ jul 28 2006, 11:21 am)</div>

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<!--quotebegin-hippo@Jul 27 2006, 09:57 AM

you may try jffs2 on cfi flash or epcs.

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17195)

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Thanks reply.

Can you give me some hint to help me try jffs2 on cfi flash? I want to use the kernel version is 2.6.x .I can&#39;t open the web

Check the very nice guide from Jdhar,

http://via.dynalias.org/svn/uclinux/doc/trunk/epcs-ug.pdf (http://via.dynalias.org/svn/uclinux/doc/trunk/epcs-ug.pdf)

who can post the pdf to me use email ?

Thanks a lot.

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17209)</div>

[/b]

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updated link,

http://www.fps-tech.net/ (http://www.fps-tech.net/)

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updated link,

http://www.fps-tech.net/ (http://www.fps-tech.net/)

<div align='right'><{post_snapback}> (index.php?act=findpost&pid=17210)</div>

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Thanks I got it.

I following guide :

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Or if you use cfi flash, in kernel menuconfig,

Memory Technology Devices (MTD) -->

<*> Memory Technology Device (MTD) support

[*] MTD partitioning support

<*> Direct char device access to MTD devices

<*> Caching block device access to MTD devices

RAM/ROM/Flash chip drivers -->

[*] Detect flash chips by Common Flash Interface (CFI) probe

[*] Detect non-CFI AMD/JEDEC-compatible flash chips

[*] Support for AMD/Fujitsu flash chips

(3) Retry failed commands (erase/program)

Mapping drivers for chip access -->

[*] Maps for Altera Nios Development Kit

File systems -->

Miscellaneous filesystems -->

<*> Journalling Flash File System v2 (JFFS2) support

Then rebuild the kernel, and boot nios2 uclinux.

It should display jffs2 support and detect mtd partitions.

+++++++++++++++++++++++++++++++++++++++++++++++++++++

Then I rebuild zImage and use nios2-download -g zImage to download my DVB, I did not program the zImage to dvb flash.

When nios2-download is complete , display boot information:

+++++++++++++++++++++++++++++++++++++++++++++++++++++

Altera Nios II support © 2004 Microtronix Datacom Ltd.

setup_arch: No persistant network settings signature at 007F0000

Built 1 zonelists

Kernel command line:

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 available: 13824k/16384k RAM, 0k/0k ROM (1329k kernel code, 1039k data)

Mount-cache hash table entries: 512 (order: 0, 4096 bytes)

NET: Registered protocol family 16

JFFS2 version 2.2. © 2001-2003 Red Hat, Inc.

NIOS serial driver version 0.0

ttyS0 (irq = 2) is a builtin NIOS UART

ttyS1 (irq = 5) is a builtin NIOS UART

ttyS2 (irq = 6) is a builtin NIOS UART

io scheduler noop registered

io scheduler deadline registered

smc_probe: 50000 Khz Nios

SMSC LAN91C111 Driver (v2.1), (Linux Kernel 2.6)

eth0: SMC91C11xFD(rev:1) at 0x80800300 IRQ:3 MEMSIZE:8192b NOWAIT:0 ADDR: 00:07:ed:00:00:00

smc_probe: 50000 Khz Nios

Altera NDK flash (AMD): Found 1 x8 devices at 0x0 in 8-bit bank

Amd/Fujitsu Extended Query Table at 0x0040

Altera NDK flash (AMD): CFI does not contain boot bank location. Assuming top.

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 4 MTD partitions on "Altera NDK flash (AMD)":

0x00200000-0x00600000 : "romfs/jffs2"

0x00000000-0x00200000 : "loader/kernel"

0x00600000-0x00700000 : "User configuration"

0x00700000-0x00800000 : "safe configuration"

NET: Registered protocol family 2

IP: routing cache hash table of 512 buckets, 4Kbytes

TCP established hash table entries: 1024 (order: 1, 8192 bytes)

TCP bind hash table entries: 1024 (order: 0, 4096 bytes)

TCP: Hash tables configured (established 1024 bind 1024)

NET: Registered protocol family 1

NET: Registered protocol family 17

Freeing unused kernel memory: 928k freed (0x115a000 - 0x1241000)

init started: BusyBox v1.1.1-pre0 (2006.05.18-03:02+0000) multi-call binary

eth0:PHY 100BaseT

eth0:PHY Full Duplex

BusyBox v1.1.1-pre0 (2006.05.18-03:02+0000) Built-in shell (msh)

Enter &#39;help&#39; for a list of built-in commands.

#

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Then I use mount cmd:

+++++++++++++++++++++++++++++++++++++++++++++++++++++# mount -t jffs2 /dev/mtdblock0 /mnt

Eep. No valid nodes for ino# 1#

+++++++++++++++++++++++++++++++++++++++++++++++++++++

I mount faile. Why? How can I solve it? Thanks a lot!

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originally posted by hippo@Jul 28 2006, 12:15 AM

first, erase the flash with nios2-flash-programmer.

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I erase the flash completd . but still mount failed.

# mount -t jffs2 /dev/mtdblock0 /mnt

Eep. No valid nodes for ino# 1#

I did not Config kernel command string "root=/dev/mtdblock0 rw rootfstype=jffs2" and not use mkfs.jffs2 to build the rootfs image.

Is it the mount fail reson?

how can I do?

Thanks a lot!

you should not set root=/dev/mtdblock0 at this time. you need to let jffs2 work first.

check if the drivers/mtd/maps/altera.c have the correct map for your board.

check the info of mtd from /sys/block .

try write and read from the mtd device, eg use "dd" .

if the mtd is erased, jffs2 will format it.

or you can make jffs2 image .

Why I did not find the /sys/block in kernel 2.6.x dir?

Where is it?

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originally posted by alex824@Jul 29 2006, 02:45 PM

why i did not find the /sys/block in kernel 2.6.x dir?

where is it?

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/sys is a runtime info in the nios2 linux, just like /proc.

it is not in the source tree.

Jdhar&#39;s site is updated,

http://www.fps-tech.net/ (http://www.fps-tech.net/)

what do you mean you can not save to mtd?

mtd block can be used as any other block dev.

try,

dd count=8 if=some_source_file of=/dev/mtdblock0

sync

power off, and reboot,

dd count=8 if=/dev/mtdblock0 of=out_file

but I think most problem should be at the mtd map file.

then check the content of out_file with the source_file.

Thanks hippo, I can r/w file on mtdblock0 and save it.

follow is my example:

1) crate a blank text file In ~/rootfs/etc . Rename the file to you wanted.

2)rebuild the zImage and reboot.

3)dd count=1 if=some_source_file of=/dev/mtdblock0

You have crated a jffs2 file after this step.

Then you can add c code as following demo code to your APP. So you can r/w and

save your jffs2 file. In jffs2 file you can save IP address, informaion,.........

# include <fcntl.h>

int main(void)

{

int ret;

int fd;

chdir("/");

char buffer[10] ={&#39;H&#39;,&#39;e&#39;,&#39;l&#39;,&#39;l&#39;,&#39;o&#39;,&#39;j&#39;,&#39;f&#39;,&#39;f&#39;,&#39;s&#39;,&#39;2&#39;};

ret = system("dd count=1 if=/dev/mtdblock0 of=test_config");

if((fd = open("test_config", O_WRONLY)) == -1)

{

printf("cannot open file. \n");

exit(1);

}

if(write(fd,buffer,10) != 10)

{

printf("write error");

}

fclose(fd);

ret = system("dd count=1 if=test_config of=/dev/mtdblock0");

return 0;

}