kernel-ark/Documentation/blackfin/Filesystems
Bryan Wu 1394f03221 blackfin architecture
This adds support for the Analog Devices Blackfin processor architecture, and
currently supports the BF533, BF532, BF531, BF537, BF536, BF534, and BF561
(Dual Core) devices, with a variety of development platforms including those
avaliable from Analog Devices (BF533-EZKit, BF533-STAMP, BF537-STAMP,
BF561-EZKIT), and Bluetechnix!  Tinyboards.

The Blackfin architecture was jointly developed by Intel and Analog Devices
Inc.  (ADI) as the Micro Signal Architecture (MSA) core and introduced it in
December of 2000.  Since then ADI has put this core into its Blackfin
processor family of devices.  The Blackfin core has the advantages of a clean,
orthogonal,RISC-like microprocessor instruction set.  It combines a dual-MAC
(Multiply/Accumulate), state-of-the-art signal processing engine and
single-instruction, multiple-data (SIMD) multimedia capabilities into a single
instruction-set architecture.

The Blackfin architecture, including the instruction set, is described by the
ADSP-BF53x/BF56x Blackfin Processor Programming Reference
http://blackfin.uclinux.org/gf/download/frsrelease/29/2549/Blackfin_PRM.pdf

The Blackfin processor is already supported by major releases of gcc, and
there are binary and source rpms/tarballs for many architectures at:
http://blackfin.uclinux.org/gf/project/toolchain/frs There is complete
documentation, including "getting started" guides available at:
http://docs.blackfin.uclinux.org/ which provides links to the sources and
patches you will need in order to set up a cross-compiling environment for
bfin-linux-uclibc

This patch, as well as the other patches (toolchain, distribution,
uClibc) are actively supported by Analog Devices Inc, at:
http://blackfin.uclinux.org/

We have tested this on LTP, and our test plan (including pass/fails) can
be found at:
http://docs.blackfin.uclinux.org/doku.php?id=testing_the_linux_kernel

[m.kozlowski@tuxland.pl: balance parenthesis in blackfin header files]
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Mariusz Kozlowski <m.kozlowski@tuxland.pl>
Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Jie Zhang <jie.zhang@analog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 12:12:58 -07:00

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