Hi Rogan,
On Fri, Aug 18, 2023 at 10:45 AM Rogan Dawes rogan@dawes.za.net wrote:
Circling back to this, I wanted to get a modern u-boot running on the Wink Hub v1 as well. Since it is possible to invoke SDP over USB (having soldered on a suitable microUSB connector), I have no concern about bricking it now. It's also a LOT easier than JTAG!
I tried to build and flash the mx28evk_defconfig, but failed to get any output on the serial console. This is likely to be unsurprising, due to the already established alternative configuration of the UART identified by Fabio.
I then patched imx28.dtsi to add duart_pins_c as per Fabio's previous patch for the Linux kernel:
- duart_pins_c: duart@2 {
- reg = <2>;
- fsl,pinmux-ids = <
- MX28_PAD_I2C0_SCL__DUART_RX
- MX28_PAD_I2C0_SDA__DUART_TX
- fsl,drive-strength = <MXS_DRIVE_8mA>;
- fsl,voltage = <MXS_VOLTAGE_HIGH>;
- fsl,pull-up = <MXS_PULL_DISABLE>;
- };
And updated mx28evk_defconfig to use duart_pins_c instead of duart_pins_a. However, I still got no output after using:
sudo $(which snagrecover) --soc imx28 -f src/snagrecover/templates/imx28-evk.yaml
I am not familiar with this tool. I was only aware of the one below:
https://source.denx.de/denx/mxsldr
Are you able to load the original vendor U-Boot with it?
Also, is the original vendor U-Boot source code available?
It is important to re-use the same DDR initialization from the original U-Boot.
with u-boot.sb in the current directory.
I also tried using the complete imx28-wink-hub-v1.dts as created by Fabio, and updated the .config to reference that instead of the imx28-evk, but I suspect that I may not have made the updates sufficiently well, if the name of the board needs to correspond with any details of the device tree? Neither of these resulted in any output.
Any other suggestions?
Please check board/freescale/mx28evk/iomux.c:
const iomux_cfg_t iomux_setup[] = { /* DUART */ MX28_PAD_PWM0__DUART_RX, MX28_PAD_PWM1__DUART_TX,
The DUART pins need to be changed here as well.