Trying to boot custom kernel on Wink Hub (i.MX28)

[Fabio Estevam]

Hi Rogan,

On Mon, Sep 25, 2023 at 6:52 AM Rogan Dawes <rogan at dawes.za.net> wrote:
>
> Hi Fabio,
>
> I used the following diff with "make mx28evk_defconfig", but unfortunately still get absolutely nothing on the DUART when running "mxsloader u-boot.sb". In fact, mxsloader returns immediately on trying to load my own u-boot.sb, whereas it hangs when running the vendor u-boot.sb, I assume because the CALL never returns. Additionally, there is no need to reset the board between attempting a custom u-boot and the vendor u-boot, indicating that the ROM-based SDP protocol handler is still running. This suggests that there is something wrong with the format of the u-boot.sb file which the ROM-based SDP protocol handler is rejecting, I would think?

I just tested loading u-boot.sb via mxsldr on my imx28-evk.

I configured the boot jumpers to USB boot, turned on the board and
then saw that it gets recognized by the host PC:

$ dmesg
....
[1710347.828895] usb 1-1: new high-speed USB device number 96 using xhci_hcd
[1710347.977657] usb 1-1: New USB device found, idVendor=15a2,
idProduct=004f, bcdDevice= 0.01
[1710347.977672] usb 1-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[1710347.977678] usb 1-1: Product: ROM Recovery
[1710347.977682] usb 1-1: Manufacturer: Freescale,Inc.
[1710347.979708] hid-generic 0003:15A2:004F.0014: hiddev0,hidraw1: USB
HID v1.10 Device [Freescale,Inc. ROM Recovery] on
usb-0000:00:14.0-1/input0

After that, I loaded the u-boot.sb via mxsldr:

$ sudo ./mxsldr u-boot.sb
Detected: i.MX28
Chip ID:          0x2800
Chip Revision:    0x0001
ROM Version:      0x0101
Protocol Version: 0x0100

Do you get these messages above (both the dmesg as well the messages
after running mxsldr)?

And in the console, I do see the U-Boot messages coming up:

HTLLCLLC

U-Boot 2023.10-rc4-00057-g4cb31a9f3560 (Sep 25 2023 - 09:49:04 -0300)

CPU:   Freescale i.MX28 rev1.2 at 454 MHz
BOOT:  USB #0
DRAM:  128 MiB
Core:  89 devices, 12 uclasses, devicetree: separate
NAND:  0 MiB
MMC:   MXS MMC: 0
Loading Environment from MMC... *** Warning - No block device, using
default environment

In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  0