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Welcome to my technical errance trying to perfect those micro-computers

2012-03-22

patch u-boot for the iconnect


Patch u-boot for the iconnect

The original u-boot monitor in the iconnect don't manage the new algorythms installed
in the last linux kernel (the number of ecc bits have changed). I understood this when
i tried to install the kernel in the flash. Whith the kernel in the flash, you don't need
an usb boot disk to start linux anymore.

Dump your uBoot environment variables before proceeding !! This procedure erase the uBoot area and its environment variables.

To compile u-boot you need an arm cross compiler. Mine is from the "Sourcery G++ Lite 2011.03-42".

I downloaded the Denx u-boot source code, but the iconnect was not in their tables. It was
necessary to modify it. The result are these patches for two versions of u-boot :



I used git to download the u-boot's sources :

mkdir /mnt/data/src/uboot/
mkdir /mnt/data/src/uboot/denx-uboot-git/
cd /mnt/data/src/uboot/denx-uboot-git/
git pull git://git.denx.de/u-boot.git
git branch -a
git fetch --tags http://git.denx.de/u-boot.git
git tag -l

the last tag was "v2011.12-rc3" then my work directory is "u-boot-2011.12-rc3.work" :

mkdir /mnt/data/src/uboot/u-boot-2011.12-rc3.work/
git archive master | tar xCv /mnt/data/src/uboot/u-boot-2011.12-rc3.work/
cd /mnt/data/src/uboot/u-boot-2011.12-rc3.work/
patch -p1 < /mnt/data/src/uboot/patches/iconnect-2011.12-rc3.patch

export ARCH=arm; export CROSS_COMPILE=/usr/local/arm-none-eabi/bin/arm-none-eabi-; export BUILD_DIR=../bin; export MAKEALL_LOGDIR=../bin; ./MAKEALL iconnect
make -j4 ARCH=arm CROSS_COMPILE=/usr/local/arm-none-eabi/bin/arm-none-eabi- O=/mnt/data/src/uboot/bin/ uboot.kwb

The result file is uboot.kwb ready to be flashed on the iconnect.

The board parameter file of openocd for the iconnect is new too. This file goes to
the /usr/local/openocd/script/board/ directory :


The jtag interface i used a dlp-usb1232h its file goes to the directory of the interfaces scripts of openocd on your system (for me : /usr/local/openocd/script/interface/) :


And this last file is to be put where you like, it contains parameters to start openocd from
the command line (like in "openocd -f ../iconnect/openocd_iconnect2.cfg") :


In the telnet window hit theses commands (explanations can be found in the page "openocd and jtag to unbrick my iconnect")

init
init2
init4
iconnect_reset_cpu
nand probe 0
nand list
nand erase 0 0x0 0xc0000
nand info 0 0 10
nand write 0 /mnt/data2/download/iconnect/arm-linux-3.3.0-rc7/iconnect-u-boot-2011.12-rc3.kwb 0 oob_softecc_kw

Reboot the iConnect and look at the new prompt on the serial console :

U-Boot 2011.12 (Mar 19 2012 - 12:08:31)
Iomega iConnect Wireless

SoC:   Kirkwood 88F6281_A0
DRAM:  256 MiB
WARNING: Caches not enabled
NAND:  512 MiB
*** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Net:   egiga0
Warning: failed to set MAC address

PHY reset timed out
88E1116 Initialized on egiga0
Hit any key to stop autoboot:  0
Marvell>> printenv
baudrate=115200
bootcmd=${x_bootcmd_kernel}; setenv bootargs ${x_bootargs} ${x_bootargs_root}; ${x_bootcmd_usb}; bootm 0x6400000;
bootdelay=3
ethact=egiga0
stderr=serial
stdin=serial
stdout=serial
x_bootargs=console=ttyS0,115200 mtdparts=orion_nand:512k(uboot),3m@1m(kernel),1m@4m(psm),13m@5m(rootfs) rw
x_bootargs_root=root=/dev/mtdblock3 rw rootfstype=jffs2
x_bootcmd_kernel=nand read 0x6400000 0x100000 0x300000
x_bootcmd_usb=usb start

Environment size: 462/131068 bytes
Marvell>>

Now you'll have to rewrite the environment variables by the serial console. Because the initial one provided by the new uBoot may not be what you expect !

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