OpenEmbedded / Angstrom : get demo binaries
Root file system pre-built images
The Root file system images are images ofjffs2 filesystems containing a entire embedded Linux system. This fielsystem is read/write capable and is designed to be stored in NAND FLASH memory available on AT91sam EK boards (256 MBytes, large pages : 2KBytes).
Included applications
List of included applications : overview and detailed package list.
|
|||||||||||||||||||||||||
Angstom 2008.1 binaries
|
||||||||||||||||||||||||||||||||||
Install a rootfs on an AT91 board
This section describes How to load a jffs2 root filesystem into the NAND FLASH of the board with SAM-BA and right through the u-boot command line. SAM-BA is the simplest way.
Note that the root file system is installed at offset 0x400000 in the NAND FLASH. From a Linux kernel point of view, this corresponds to the index 1 of the MTD subsystem device (/dev/mtd1 and /dev/mtdblock1).
Note also that this operation will need a complete erase of the board NAND FLASH. Be sure not to loose data during this operation.
Using SAM-BA
- Connect the USB Device Interface to your host machine using the USB Device Cable
- Make sure that the chip can execute the bootROM monitor SAM-BA-boot :
- Start SAM-BA GUI Application
- Select the the board in the drop-down menu and choose the USB Connection
- Eventually plug back a jumper to access the media on which u-boot must be loaded to
- In the main SAM-BA window :
- Choose the NandFlash media tab in the SAM-BA GUI interface
- Initialize the media choosing the NandFlash Init action in the Scripts rolling menu and press Execute
- In the same Scripts menu choose the NandFlash Erase All action and press Execute . A Please Wait... dialog window is appearing: wait for the end of the erase process
- Press on Send File Name Browse button
- Choose the filesystem image file ( x11-image-demo-at91sam9263ek.jffs2 for example) and press Open
- Enter the proper address on media in the Address text field. You can find a media map for each product in GettingStarted#Linux4SAM_DataFlash_demo_Memory and GettingStarted#Linux4SAM_NandFlash_demo_Memory
- Press Send File button. A Please Wait... dialog window is appearing: wait for the end of the flashing process
- On AT91SAM9260-EK or AT91SAM9XE-EK, If you have erased the booting media, do not forget to replace AT91Bootstrap in it
- Close SAM-BA, remove the USB cable
Using u-boot commands
Here is a reference documentation about JFFS2 as root filesystem
on the u-boot documentation website.
Following commands documentation is available in the u-boot doc/README.nand documentation file.
1. erase the whole NAND FLASH
U-Boot> nand erase NAND erase: device 0 whole chip Skipping bad block at 0x000c0000 Skipping bad block at 0x009c0000 Erasing at 0xffe0000 -- 100% complete. OK2. download the JFFS2 filesystem from TFTP to the board RAM (address 0x21400000(1))
U-Boot> tftp 0x21400000 x11-image-demo-at91sam9263ek.jffs2
TFTP from server 10.159.240.137; our IP address is 10.159.245.170
Filename 'nferre/x11-image-demo-at91sam9263ek.jffs2'.
Load address: 0x21400000
Loading: T #################################################################
#######################################################T ##########
#################################################################
[..]
#########################
done
Bytes transferred = 26083328 (18e0000 hex)
remember the number of Bytes transferred just indicated above. It will be useful for the nand write.jffs2 command.
3. write the filesystem from RAM@0x21400000(2) to NAND FLASH at offset 0x400000 (Linux /dev/mtdblock1). Note the last parameter : it is the number of Bytes transferred indicated in the previous command.
U-Boot> nand write.jffs2 0x21400000 0x400000 0x18e0000 NAND write: device 0 offset 0, size 26083328 ... Bad block at 0xc0000 in erase block from 0xc0000 will be skipped Bad block at 0x9c0000 in erase block from 0x9c0000 will be skipped Writing data at 0x195f800 -- 100% complete. OK
Note that bad blocks just shown above are normal behavior of a NAND FLASH : they are skipped and the filesystem will not mind, it is designed to manage them.
Good, now you have a fresh JFFS2 filesystem you can boot on.
Notes 1 , 2 :
for at91sam9g45 family: use proper location for RAM: 0x70000000 instead of 0x20000000
|
||||||||||||||||||||||||||||||||||||
r22 - 07 Jun 2010 - 14:16:24 - NicolasFerre
Linux4SAM
Copyright © by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Linux® is the registered trademark of Linus Torvalds in the U.S. and other countries.
Microchip® and others, are registered trademarks or trademarks of Microchip Technology Inc. and its subsidiaries. 
Arm® and others are registered trademarks or trademarks of Arm Limited (or its affiliates). Other terms and product names may be trademarks of others.
Ideas, requests, contributions ? Connect to LinksToCommunities page.