| Bryan Wu | 1394f03 | 2007-05-06 14:50:22 -0700 | [diff] [blame] | 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 |