mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-24 21:54:01 +00:00
a187559e3d
Correct spelling of "U-Boot" shall be used in all written text (documentation, comments in source files etc.). Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Heiko Schocher <hs@denx.de> Reviewed-by: Simon Glass <sjg@chromium.org> Reviewed-by: Minkyu Kang <mk7.kang@samsung.com>
114 lines
3.6 KiB
Text
114 lines
3.6 KiB
Text
Overview
|
|
--------------
|
|
|
|
mx35pdk (known als as mx35_3stack) is a development board by Freescale.
|
|
It consists of three pluggable board:
|
|
- CPU module, with CPU, RAM, flash
|
|
- Personality board, with most interfaces (USB, Network,..)
|
|
- Debug board with JTAG header.
|
|
|
|
The board is usually delivered with redboot. This howto explains how to boot
|
|
a linux kernel and how to replace the original bootloader with U-Boot.
|
|
|
|
The board is delivered with Redboot on the NAND flash. It is possible to
|
|
switch the boot device with the switches SW1-SW2 on the Personality board,
|
|
and with SW5-SW10 on the Debug board.
|
|
|
|
Delivered Redboot script to start the kernel
|
|
---------------------------------------------------
|
|
|
|
In redboot the following script is stored:
|
|
|
|
fis load kernel
|
|
exec -c "noinitrd console=ttymxc0,115200 root=/dev/mtdblock8 rw rootfstype=jffs2 ip=dhcp fec_mac=00:04:9F:00:E7:76"
|
|
|
|
Kernel is taken from flash. The image is in zImage format.
|
|
|
|
Booting from NET, rootfs on NFS:
|
|
-----------------------------------
|
|
|
|
To change the script in redboot:
|
|
|
|
load -r -b 0x100000 <path_to_zImage>
|
|
exec -c "noinitrd console=ttymxc0,115200 root=/dev/nfsroot rootfstype=nfsroot nfsroot=192.168.1.1:/opt/eldk-4.2-arm/armVFP rw ip=dhcp"
|
|
|
|
If the ip address is not set, you can set it with :
|
|
|
|
ip_address -l <board_ip/netmask> -h <server_ip>
|
|
|
|
Linux partitions:
|
|
---------------------------
|
|
|
|
As default, the board is shipped with these partition tables for NAND
|
|
and for NOR:
|
|
|
|
Creating 5 MTD partitions on "NAND 2GiB 3,3V 8-bit":
|
|
0x00000000-0x00100000 : "nand.bootloader"
|
|
0x00100000-0x00600000 : "nand.kernel"
|
|
0x00600000-0x06600000 : "nand.rootfs"
|
|
0x06600000-0x06e00000 : "nand.configure"
|
|
0x06e00000-0x80000000 : "nand.userfs"
|
|
|
|
Creating 6 MTD partitions on "mxc_nor_flash.0":
|
|
0x00000000-0x00080000 : "Bootloader"
|
|
0x00080000-0x00480000 : "nor.Kernel"
|
|
0x00480000-0x02280000 : "nor.userfs"
|
|
0x02280000-0x03e80000 : "nor.rootfs"
|
|
0x01fe0000-0x01fe3000 : "FIS directory"
|
|
0x01fff000-0x04000000 : "Redboot config"
|
|
|
|
NAND partitions can be recognized enabling in kernel CONFIG_MTD_REDBOOT_PARTS.
|
|
For this board, CONFIG_MTD_REDBOOT_DIRECTORY_BLOCK should be set to 2.
|
|
|
|
However, the setup in redboot is not correct and does not use the whole flash.
|
|
|
|
Better solution is to use the kernel parameter mtdparts.
|
|
Here the resulting script to be defined in RedBoot with fconfig:
|
|
|
|
load -r -b 0x100000 sbabic/mx35pdk/zImage.2.6.37
|
|
exec -c "noinitrd console=ttymxc0,115200 root=/dev/nfsroot rootfstype=nfsroot nfsroot=192.168.1.1:/opt/eldk-4.2-arm/arm rw ip=dhcp mtdparts=mxc_nand:1m(boot),5m(linux),96m(root),8m(cfg),1938m(user);physmap-flash.0:512k(b),4m(k),30m(u),28m(r)"
|
|
|
|
Flashing U-Boot
|
|
--------------------------------
|
|
|
|
U-Boot should be stored on the NOR flash.
|
|
|
|
The boot storage can be select using the switches on the personality board
|
|
(SW1-SW2) and on the DEBUG board (SW4-SW10).
|
|
|
|
If something goes wrong flashing the bootloader, it is always possible to
|
|
recover the board booting from the other device.
|
|
|
|
Saving U-Boot in the NOR flash
|
|
---------------------------------
|
|
|
|
Check the partition for boot in the NOR flash. Setting the mtdparts as reported,
|
|
the boot partition should be /dev/mtd0.
|
|
|
|
Creating 6 MTD partitions on "mxc_nor_flash.0":
|
|
0x00000000-0x00080000 : "Bootloader"
|
|
0x00080000-0x00480000 : "nor.Kernel"
|
|
0x00480000-0x02280000 : "nor.userfs"
|
|
0x02280000-0x03e80000 : "nor.rootfs"
|
|
0x01fe0000-0x01fe3000 : "FIS directory"
|
|
0x01fff000-0x04000000 : "Redboot config"
|
|
|
|
To erase the whole partition:
|
|
$ flash_eraseall /dev/mtd0
|
|
|
|
Writing U-Boot:
|
|
dd if=u-boot.bin of=/dev/mtd0
|
|
|
|
To boot from NOR, you have to select the switches as follows:
|
|
|
|
Personality board
|
|
SW2 all off
|
|
SW1 all off
|
|
|
|
Debug Board:
|
|
SW5 0
|
|
SW6 0
|
|
SW7 0
|
|
SW8 1
|
|
SW9 1
|
|
SW10 0
|