Based on kernel version 2.6.26. Page generated on 2008-07-16 21:12 EST.
1 /* 2 * File: Documentation/blackfin/Filesystems 3 * Based on: 4 * Author: 5 * 6 * Created: 7 * Description: This file contains the simple DMA Implementation for Blackfin 8 * 9 * Rev: $Id: Filesystems 2384 2006-11-01 04:12:43Z magicyang $ 10 * 11 * Modified: 12 * Copyright 2004-2006 Analog Devices Inc. 13 * 14 * Bugs: Enter bugs at http://blackfin.uclinux.org/ 15 * 16 */ 17 18 How to mount the root file system in uClinux/Blackfin 19 ----------------------------------------------------- 20 21 1 Mounting EXT3 File system. 22 ------------------------ 23 24 Creating an EXT3 File system for uClinux/Blackfin: 25 26 27 Please follow the steps to form the EXT3 File system and mount the same as root 28 file system. 29 30 a Make an ext3 file system as large as you want the final root file 31 system. 32 33 mkfs.ext3 /dev/ram0 <your-rootfs-size-in-1k-blocks> 34 35 b Mount this Empty file system on a free directory as: 36 37 mount -t ext3 /dev/ram0 ./test 38 where ./test is the empty directory. 39 40 c Copy your root fs directory that you have so carefully made over. 41 42 cp -af /tmp/my_final_rootfs_files/* ./test 43 44 (For ex: cp -af uClinux-dist/romfs/* ./test) 45 46 d If you have done everything right till now you should be able to see 47 the required "root" dir's (that's etc, root, bin, lib, sbin...) 48 49 e Now unmount the file system 50 51 umount ./test 52 53 f Create the root file system image. 54 55 dd if=/dev/ram0 bs=1k count=<your-rootfs-size-in-1k-blocks> \ 56 > ext3fs.img 57 58 59 Now you have to tell the kernel that will be mounting this file system as 60 rootfs. 61 So do a make menuconfig under kernel and select the Ext3 journaling file system 62 support under File system --> submenu. 63 64 65 2. Mounting EXT2 File system. 66 ------------------------- 67 68 By default the ext2 file system image will be created if you invoke make from 69 the top uClinux-dist directory. 70 71 72 3. Mounting CRAMFS File System 73 ---------------------------- 74 75 To create a CRAMFS file system image execute the command 76 77 mkfs.cramfs ./test cramfs.img 78 79 where ./test is the target directory. 80 81 82 4. Mounting ROMFS File System 83 -------------------------- 84 85 To create a ROMFS file system image execute the command 86 87 genromfs -v -V "ROMdisk" -f romfs.img -d ./test 88 89 where ./test is the target directory 90 91 92 5. Mounting the JFFS2 Filesystem 93 ----------------------------- 94 95 To create a compressed JFFS filesystem (JFFS2), please execute the command 96 97 mkfs.jffs2 -d ./test -o jffs2.img 98 99 where ./test is the target directory. 100 101 However, please make sure the following is in your kernel config. 102 103 /* 104 * RAM/ROM/Flash chip drivers 105 */ 106 #define CONFIG_MTD_CFI 1 107 #define CONFIG_MTD_ROM 1 108 /* 109 * Mapping drivers for chip access 110 */ 111 #define CONFIG_MTD_COMPLEX_MAPPINGS 1 112 #define CONFIG_MTD_BF533 1 113 #undef CONFIG_MTD_UCLINUX 114 115 Through the u-boot boot loader, use the jffs2.img in the corresponding 116 partition made in linux-2.6.x/drivers/mtd/maps/bf533_flash.c. 117 118 NOTE - Currently the Flash driver is available only for EZKIT. Watch out for a 119 STAMP driver soon. 120 121 122 6. Mounting the NFS File system 123 ----------------------------- 124 125 For mounting the NFS please do the following in the kernel config. 126 127 In Networking Support --> Networking options --> TCP/IP networking --> 128 IP: kernel level autoconfiguration 129 130 Enable BOOTP Support. 131 132 In Kernel hacking --> Compiled-in kernel boot parameter add the following 133 134 root=/dev/nfs rw ip=bootp 135 136 In File system --> Network File system, Enable 137 138 NFS file system support --> NFSv3 client support 139 Root File system on NFS 140 141 in uClibc menuconfig, do the following 142 In Networking Support 143 enable Remote Procedure Call (RPC) support 144 Full RPC Support 145 146 On the Host side, ensure that /etc/dhcpd.conf looks something like this 147 148 ddns-update-style ad-hoc; 149 allow bootp; 150 subnet 10.100.4.0 netmask 255.255.255.0 { 151 default-lease-time 122209600; 152 max-lease-time 31557600; 153 group { 154 host bf533 { 155 hardware ethernet 00:CF:52:49:C3:01; 156 fixed-address 10.100.4.50; 157 option root-path "/home/nfsmount"; 158 } 159 } 160 161 ensure that /etc/exports looks something like this 162 /home/nfsmount *(rw,no_root_squash,no_all_squash) 163 164 run the following commands as root (may differ depending on your 165 distribution) : 166 - service nfs start 167 - service portmap start 168 - service dhcpd start 169 - /usr/sbin/exportfs