170 lines
4.1 KiB
Plaintext
170 lines
4.1 KiB
Plaintext
/*
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* File: Documentation/blackfin/Filesystems
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* Based on:
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* Author:
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*
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* Created:
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* Description: This file contains the simple DMA Implementation for Blackfin
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*
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* Rev: $Id: Filesystems 2384 2006-11-01 04:12:43Z magicyang $
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*
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* Modified:
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* Copyright 2004-2006 Analog Devices Inc.
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*
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* Bugs: Enter bugs at http://blackfin.uclinux.org/
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*
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*/
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How to mount the root file system in uClinux/Blackfin
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-----------------------------------------------------
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1 Mounting EXT3 File system.
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------------------------
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Creating an EXT3 File system for uClinux/Blackfin:
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Please follow the steps to form the EXT3 File system and mount the same as root
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file system.
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a Make an ext3 file system as large as you want the final root file
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system.
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mkfs.ext3 /dev/ram0 <your-rootfs-size-in-1k-blocks>
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b Mount this Empty file system on a free directory as:
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mount -t ext3 /dev/ram0 ./test
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where ./test is the empty directory.
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c Copy your root fs directory that you have so carefully made over.
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cp -af /tmp/my_final_rootfs_files/* ./test
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(For ex: cp -af uClinux-dist/romfs/* ./test)
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d If you have done everything right till now you should be able to see
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the required "root" dir's (that's etc, root, bin, lib, sbin...)
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e Now unmount the file system
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umount ./test
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f Create the root file system image.
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dd if=/dev/ram0 bs=1k count=<your-rootfs-size-in-1k-blocks> \
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> ext3fs.img
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Now you have to tell the kernel that will be mounting this file system as
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rootfs.
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So do a make menuconfig under kernel and select the Ext3 journaling file system
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support under File system --> submenu.
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2. Mounting EXT2 File system.
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-------------------------
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By default the ext2 file system image will be created if you invoke make from
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the top uClinux-dist directory.
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3. Mounting CRAMFS File System
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----------------------------
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To create a CRAMFS file system image execute the command
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mkfs.cramfs ./test cramfs.img
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where ./test is the target directory.
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4. Mounting ROMFS File System
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--------------------------
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To create a ROMFS file system image execute the command
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genromfs -v -V "ROMdisk" -f romfs.img -d ./test
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where ./test is the target directory
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5. Mounting the JFFS2 Filesystem
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-----------------------------
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To create a compressed JFFS filesystem (JFFS2), please execute the command
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mkfs.jffs2 -d ./test -o jffs2.img
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where ./test is the target directory.
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However, please make sure the following is in your kernel config.
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/*
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* RAM/ROM/Flash chip drivers
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*/
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#define CONFIG_MTD_CFI 1
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#define CONFIG_MTD_ROM 1
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/*
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* Mapping drivers for chip access
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*/
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#define CONFIG_MTD_COMPLEX_MAPPINGS 1
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#define CONFIG_MTD_BF533 1
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#undef CONFIG_MTD_UCLINUX
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Through the u-boot boot loader, use the jffs2.img in the corresponding
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partition made in linux-2.6.x/drivers/mtd/maps/bf533_flash.c.
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NOTE - Currently the Flash driver is available only for EZKIT. Watch out for a
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STAMP driver soon.
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6. Mounting the NFS File system
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-----------------------------
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For mounting the NFS please do the following in the kernel config.
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In Networking Support --> Networking options --> TCP/IP networking -->
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IP: kernel level autoconfiguration
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Enable BOOTP Support.
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In Kernel hacking --> Compiled-in kernel boot parameter add the following
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root=/dev/nfs rw ip=bootp
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In File system --> Network File system, Enable
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NFS file system support --> NFSv3 client support
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Root File system on NFS
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in uClibc menuconfig, do the following
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In Networking Support
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enable Remote Procedure Call (RPC) support
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Full RPC Support
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On the Host side, ensure that /etc/dhcpd.conf looks something like this
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ddns-update-style ad-hoc;
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allow bootp;
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subnet 10.100.4.0 netmask 255.255.255.0 {
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default-lease-time 122209600;
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max-lease-time 31557600;
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group {
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host bf533 {
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hardware ethernet 00:CF:52:49:C3:01;
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fixed-address 10.100.4.50;
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option root-path "/home/nfsmount";
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}
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}
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ensure that /etc/exports looks something like this
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/home/nfsmount *(rw,no_root_squash,no_all_squash)
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run the following commands as root (may differ depending on your
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distribution) :
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- service nfs start
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- service portmap start
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- service dhcpd start
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- /usr/sbin/exportfs
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