Ben , Further to my previous mail I have another problem with my busybox initrd/RAMDISK system -my ext2 root file system is mounted as root && Read only .as a result my mknod etc commands always returns ERROR -- root mounted as read only ?
Any pointers for the same ? to make my RAMDISK read/writable ? so that i can check by your method ? Thanks , Arun On 7/24/06, Arun Kumar <arunkat at gmail.com> wrote: > > Hi Ben , > > Thanks for your reply .It was indeed very comrehensive .I am able to > proceed further But still there is a bit problem . > > When I try to mknod physically viz mknod /dev/mtd0 ..... > > It says the node is readonly . > > Can you please point out the problem . I am attaching a dump of the > console . > > > Linux/PPC load: > Uncompressing Linux...done. > Now booting the kernel .... > Memory BAT mapping: BAT2=64Mb, BAT3=0Mb, residual: 0Mb > Linux version 2.4.20_mvl31 ( aks at IIB-A1040829) (gcc version > 3.3.1(MontaVista > 3.3 > .1-3.0.10.0300532 2003-12-24)) #368 Mon Jul 24 13:02:13 IST 2006 > DBAT0U = 0x800001fe > DBAT0L = 0x8000002a > DBAT1U = 0xf0001ffe > DBAT1L = 0xf000002a > DBAT2U = 0xc00007fe > DBAT2L = 0x00000002 > DBAT3U = 0xff8001fe > DBAT3L = 0xff80002a > ET4K Montavista Linux Test Platform > Port by Agere Systems > On node 0 totalpages: 16384 > zone(0): 16384 pages. > zone(1): 0 pages. > zone(2): 0 pages. > Kernel command line: > OpenPIC Version 1.2 (1 CPUs and 14 IRQ sources) at fcf40000 > Calibrating delay loop... 884.73 BogoMIPS > Memory: 62084k available (1000k kernel code, 356k data, 76k init, 0k > highmem) > Dentry cache hash table entries: 8192 (order: 4, 65536 bytes) > Inode cache hash table entries: 4096 (order: 3, 32768 bytes) > Mount-cache hash table entries: 1024 (order: 1, 8192 bytes) > Buffer-cache hash table entries: 4096 (order: 2, 16384 bytes) > Page-cache hash table entries: 16384 (order: 4, 65536 bytes) > POSIX conformance testing by UNIFIX > PCI: Probing PCI hardware > Scanning bus 00 > Found 00:00 [1057/0006] 000600 00 > PCI:00:00.0 Resource 0 [00000000-ffffffff] is unassigned > PCI:00:00.0 Resource 1 [00000000-00000fff] is unassigned > PCI:00:00.0 Resource 2 [00000000-ffffffff] is unassigned > Found 00:78 [8086/1013] 000200 00 > PCI:00:0f.0 Resource 6 [00000000-0000ffff] is unassigned > Found 00:f0 [0700/1107] 000600 00 > Fixups for bus 00 > Bus scan for 00 returning with max=00 > PCI: bridge rsrc fc000000..fcc00000 (100), parent c011ddd4 > PCI: bridge rsrc 80000000..fe000000 (200), parent c011ddf0 > PCI:00:0f.0: Resource 0: fdfe0000-fdffffff (f=204) > PCI:00:0f.0: Resource 2: fdfd0000-fdfdffff (f=204) > PCI:00:0f.0: Resource 4: fcbfffc0-fcbfffff (f=101) > PCI:00:1e.0: Resource 0: fc000000-fcffffff (f=120c) > PCI:00:1e.0: Resource 2: fcbffe00-fcbffeff (f=101) > Linux NET4.0 for Linux 2.4 > Based upon Swansea University Computer Society NET3.039 > Initializing RT netlink socket > > LSP Revision 1 > Starting kswapd > Disabling the Out Of Memory Killer > JFFS2 version 2.1. (C) 2001, 2002 Red Hat, Inc., designed by Axis > Communications > AB. > Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ > SERIAL_PCI en > abled > ttyS00 at 0xfcf04500 (irq = 13) is a ST16650 > RAMDISK driver initialized: 16 RAM disks of 8192K size 1024 blocksize > > AMD_FLASH_INIT called *aks * > physmap flash device: 800000 at ff800000 virtual address Number of erase > regions > : 4 > Primary Vendor Command Set: 0002 (AMD/Fujitsu Standard) > Primary Algorithm Table at 0040 > Alternative Vendor Command Set: 0000 (None) > No Alternate Algorithm Table > Vcc Minimum: 2.7 V > Vcc Maximum: 3.6 V > No Vpp line > Typical byte/word write timeout: 128 ?s > Maximum byte/word write timeout: 256 ?s > Full buffer write not supported > Typical block erase timeout: 1024 ms > Maximum block erase timeout: 16384 ms > Chip erase not supported > Device size: 0x200000 bytes (2 MiB) > Flash Device Interface description: 0x0002 > - supports x8 and x16 via BYTE# with asynchronous interface > Max. bytes in buffer write: 0x1 > Number of Erase Block Regions: 4 > Erase Region #0: BlockSize 0x4000 bytes, 1 blocks > Erase Region #1: BlockSize 0x2000 bytes, 2 blocks > Erase Region #2: BlockSize 0x8000 bytes, 1 blocks > Erase Region #3: BlockSize 0x10000 bytes, 31 blocks > Amd/Fujitsu Extended Query Table v1.3 at 0x0040 > number of CFI chips: 4 > > in amdstd_setup 0: offset=0x0,size=0x10000,blocks=1 > 1: offset=0x10000,size=0x8000,blocks=2 > 2: offset=0x20000,size=0x20000,blocks=1 > 3: offset=0x40000,size=0x40000,blocks=31 > 4: offset=0x800000,size=0x10000,blocks=1 > 5: offset=0x810000,size=0x8000,blocks=2 > 6: offset=0x820000,size=0x20000,blocks=1 > 7: offset=0x840000,size=0x40000,blocks=31 > 8: offset=0x1000000,size=0x10000,blocks=1 > 9: offset=0x1010000,size=0x8000,blocks=2 > 10: offset=0x1020000,size=0x20000,blocks=1 > 11: offset=0x1040000,size=0x40000,blocks=31 > 12: offset=0x1800000,size=0x10000,blocks=1 > 13: offset=0x1810000,size=0x8000,blocks=2 > 14: offset=0x1820000,size=0x20000,blocks=1 > 15: offset=0x1840000,size=0x40000,blocks=31 > cfi_cmdset_0002: Disabling fast programming due to code brokenness. aks > Enabling > * > > > in MTD Partitioning <5>No RedBoot partition table detected in > phys_mapped_flash > > Using physmap partition definition > Creating 3 MTD partitions on "phys_mapped_flash": > 0x00000000-0x00040000 : "agere-ets0" > mtd: Giving out device 0 to agere-ets0 > 0x00040000-0x00080000 : "agere-ets1" > mtd: Giving out device 1 to agere-ets1 > 0x00080000-0x0007fffe : "agere-ets2" > mtd: partition "agere-ets2" doesn't end on an erase block -- force > read-only > mtd: Giving out device 2 to agere-ets2 > > NET4: Linux TCP/IP 1.0 for NET4.0 > IP Protocols: ICMP, UDP, TCP, IGMP > IP: routing cache hash table of 512 buckets, 4Kbytes > TCP: Hash tables configured (established 4096 bind 8192) > IP-Config: No network devices available. > NET4: Unix domain sockets 1.0/SMP for Linux NET4.0. > /dev/console mapped to mkdev 5: minor: 1 > RAMDISK: Compressed image found at block 0 > Freeing initrd memory: 1247k freed > VFS: Mounted root (ext2 filesystem) readonly. > Freeing unused kernel memory: 76k init > calling sbin/init > init started: BusyBox v1.2.0 (2006.07.12-05:25+0000) multi-call binary > init started: BusyBox v1.2.0 (2006.07.12-05:25+0000) multi-call binary > Starting pid 8, console /dev/ttyS0: '/bin/ash' > > > BusyBox v1.2.0 (2006.07.12-05:25+0000) Built-in shell (ash) > Enter 'help' for a list of built-in commands. > > / $ mknod /dev/mtd0 c 90 0 > mknod: /dev/mtd0: Read-only file system > / $ > > > also can you point out why it is trying to disable the fast programming ? > > > Thanks, > Arun > > > > On 7/21/06, Ben Warren < bwarren at qstreams.com> wrote: > > > > Hi Arun, > > > > On Fri, 2006-07-21 at 20:26 +0530, Arun Kumar wrote: > > > Hi , > > > Can anyone help me in this naive problem ? > > > > > Then a naive answer is most fitting... Turns out that's my specialty. > > > > > # > > > # Memory Technology Devices (MTD) > > > # > > > CONFIG_MTD=y > > > CONFIG_MTD_DEBUG=y > > > CONFIG_MTD_DEBUG_VERBOSE=2 > > > CONFIG_MTD_PARTITIONS=y > > > CONFIG_MTD_CONCAT=y > > > CONFIG_MTD_REDBOOT_PARTS=y > > > CONFIG_MTD_CMDLINE_PARTS=y > > Probably get rid of REDBOOT if you're not using that bootloader > > > > > > # > > > # User Modules And Translation Layers > > > # > > > # CONFIG_MTD_CHAR is not set > > > # CONFIG_MTD_BLOCK is not set > > > # CONFIG_MTD_BLOCK_RO is not set > > > # CONFIG_FTL is not set > > > # CONFIG_NFTL is not set > > > # CONFIG_INFTL is not set > > > > > You need to enable MTD_CHAR to read/write and MTD_BLOCK to mount > > > > > Can any happy soul let me know :-- > > > > > > 1)How to mount jffs2 on this flash and also to test mtd->read/write > > > routines ? > > Start with the char drivers (/dev/mtd0 etc.). You'll need one for each > > partition you want to experiment with. > > How about creating the nodes manually? > > > > mknod /dev/mtd0 c 90 0 > > mknod /dev/mtd1 c 90 2 etc. (minor # increments in 2s) > > > > Add a block device for each partition: > > > > mknod /dev/mtdblock0 b 31 0 > > mknod /dev/mtdblock1 b 31 1 etc. > > > > Once you clean up #3 below, you should be able to read/write the char > > devices using commands like 'cat', or write a simple user-space app > > using "open, read, write", etc if you'd rather look at the actual binary > > data. > > > > You can then experiment with mounting the JFFS2. I recommend booting to > > an NFS file system then mounting the JFFS2 with something like: > > > > mount -t jffs2 /dev/mtdblock5 /mnt/temp (Use the correct partition) > > > > > > > > 2) Is it ok not to see mtd0.. partions in /dev directory . > > Pretty sure you'll need these > > > > > > 3 ) Where do I register the mtd partitions to get them noticed > > > here ?? > > Looks like your partitions are already being found, but are probably not > > set up right. I don't know if this is a static definition in your board > > init code or passed by command line from the bootloader, but it looks > > like the values don't line up with your device: > > > > ********* > > Using physmap partition definition > > Creating 3 MTD partitions on "phys_mapped_flash": > > 0x00000000-0x00040000 : "foo-ets0" > > mtd: Giving out device 0 to foo-ets0 > > 0x00040000-0x001e0000 : "foo-ets1" > > mtd: partition "agere-ets1" doesn't end on an erase block -- force > > read-only > > mtd: Giving out device 1 to foo-ets1 > > 0x001e0000-0x00200000 : "foo-ets2" > > mtd: partition "foo-ets2" doesn't start on an erase block boundary -- > > force read-only > > ********* > > -------------------------------------------------------------------------- > > > > Hopefully this helps you proceed a little bit. > > > > regards, > > Ben > > > > > > > -- > Arun Kumar Singh > Tech Lead. > Agere India > Bangalore > -- Arun Kumar Singh Tech Lead. 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