Can I update and save file when n2linux running?

[Altera_Forum]

hi all: 

 I want to update some files( for example: rework the prime IP setting in   `etc/inittab) when the nios2 uclinux is running. Then reset the DVB, the uclinux   will confing the system bases the updated inittab file.  I think to I can use these function :file_open, file_read, file_write to rework the  file of I want to rework. But the nios2 uclinux is ramfs,so the file just a allude file.  The fact file is stored in flash. Can I rework the fact file ? If can, how can I do?  Who can give me some advice? Thanks a lot.

[Altera_Forum]

you may try jffs2 on cfi flash or epcs.

[Altera_Forum]

--- Quote Start ---  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)  --- quote end ---    --- Quote End ---    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.

[Altera_Forum]

--- Quote Start ---  originally posted by alex824+jul 28 2006, 11:21 am--><div class='quotetop'>quote (alex824 @ jul 28 2006, 11:21 am)</div>  --- quote start ---  <!--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)  --- quote end ---    --- Quote End ---    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]  --- Quote End ---   updated link, http://www.fps-tech.net/ (http://www.fps-tech.net/)

[Altera_Forum]

--- Quote End ---   updated link, http://www.fps-tech.net/ (http://www.fps-tech.net/) <div align='right'><{post_snapback}> (index.php?act=findpost&pid=17210)</div>   --- Quote End ---    Thanks I got it.  I following guide :  +++++++++++++++++++++++++++++++++++++++++++++++++++++ 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. #  +++++++++++++++++++++++++++++++++++++++++++++++++++++  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!

[Altera_Forum]

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

[Altera_Forum]

--- Quote Start ---  originally posted by hippo@Jul 28 2006, 12:15 AM first, erase the flash with nios2-flash-programmer. <div align='right'><{post_snapback}> (index.php?act=findpost&pid=17214)  --- quote end ---    --- Quote End ---    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!

[Altera_Forum]

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 .

[Altera_Forum]

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

 Where is it?

[Altera_Forum]

--- Quote Start ---  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? <div align='right'><{post_snapback}> (index.php?act=findpost&pid=17244)  --- quote end ---    --- Quote End ---   /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.

[Altera_Forum]

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; }

[Altera_Forum]

good. 

the mtd block is working. now you can try erase again and mount jffs2 on it.

[Altera_Forum]

--- Quote Start ---  originally posted by hippo@Jul 31 2006, 09:00 AM good. the mtd block is working. now you can try erase again and mount jffs2 on it. <div align='right'><{post_snapback}> (index.php?act=findpost&pid=17286)  --- quote end ---    --- Quote End ---    I use "# mount -t jffs2 /dev/mtdblock0 /mnt"  but the erro information is: +++++++++++++++++++++++++++++++++++++++++++++++++++++# mount -t jffs2 /dev/mtdblock0 /mnt jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000000: 0x6548 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000004: 0x6a6f in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000008: 0x3273 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000000c: 0x7473 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000010: 0x6c69 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000014: 0x3a0a in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000018: 0x6e69 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x0000001c: 0x0a68 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000020: 0x6d65 in stead jffs2_scan_eraseblock(): Magic bitmask 0x1985 not found at 0x00000024: 0x783a in stead Further such events for this erase block will not be printed Eep. No valid nodes for ino# 1#  +++++++++++++++++++++++++++++++++++++++++++++++++++++  why?