Hi Rogan,
On Thu, Jun 22, 2023 at 7:09 PM Rogan Dawes <ro...@dawes.za.net> wrote:
>
> I tried to follow your suggestion, but so far I have been unsuccessful.
>
> I cloned Linus' latest source code, and then did:
>
> make ARCH=arm mxs_defconfig
> make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi-
> cat arch/arm/boot/zImage ./arch/arm/boot/dts/imx28-evk.dtb >
> arch/arm/boot/zImage_with_dtb
Do you have access to the Wink Hub v1 board schematics? What about the
original U-Boot and kernel source?
You are using imx28-evk.dtb here, but not sure if the console pins are
the same for the two boards.
It is better to create a minimal devicetree specific for Wink Hub v1.
To start with, you can only describe the duart node there.
> cd arch/arm/boot
> mkimage -T kernel -A arm -O linux -a 0x40008000 -e 0x40008000 -C none -d
> ./zImage_with_dtb uImage_with_dtb
>
> then copied onto the Wink hub and did:
>
> flash_erase /dev/mtd4 0 0
> nandwrite -p -m /dev/mtd4 uImage_with_dtb
> reboot
>
> I then interrupted u-boot, and had to update the number of bytes read from
> the mtd4 partition (was 0x00400000, now 0x00600000), as the new kernel was
> about 4 times larger than the vendor kernel, and I was getting checksum
> errors due to only partial read of the image.
>
> setenv app_boot 'run appboot_args && nand read ${loadaddr} app-kernel
> 0x00600000 && bootm ${loadaddr}'
> run app_boot
>
> NAND read: device 0 offset 0x2b00000, size 0x600000
> 6291456 bytes read: OK
> ## Booting kernel from Legacy Image at 42000000 ...
> Image Name:
> Created: 2023-06-22 21:37:11 UTC
> Image Type: ARM Linux Kernel Image (uncompressed)
> Data Size: 6279041 Bytes = 6 MiB
> Load Address: 40008000
> Entry Point: 40008000
> Verifying Checksum ... OK
> Loading Kernel Image ... OK
>
> Starting kernel ...
>
> And it stopped there after dumping some garbage to the screen.
You should also pass the kernel command line: console=ttyAMA0,115200n8
As far as I recall, the 2.6.35 kernel used a different console device.
Can you share the U-Boot log of the board booting the 2.6.35 kernel?
> I did note that the mxs_defconfig did not define the appended DTB config, so
> I updated my .config as follows:
>
> $ grep DTB .config
> CONFIG_ARM_APPENDED_DTB=y
> CONFIG_ARM_ATAG_DTB_COMPAT=y
> CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_FROM_BOOTLOADER=y
> # CONFIG_ARM_ATAG_DTB_COMPAT_CMDLINE_EXTEND is not set
One thing you could also try is to load U-Boot via USB using this tool:
https://source.denx.de/denx/mxsldr
To build U-Boot for mx28, please check:
https://source.denx.de/u-boot/u-boot/-/blob/master/doc/imx/common/mxs.txt
