Video: https://youtu.be/kikk80eOvgI
Infos: https://kulissenhelden.de/feindfahrt/

#larp #uboot #abenteuer

Well, my silly question has hit the list. I'm sure there's some bleeding obvious thing I've missed that explains why the MAC and PHY aren't talking… but I'm not seeing it just now. A second pair of eyes may spot it.

https://lists.denx.de/pipermail/u-boot/2026-June/621046.html

#UBoot #embedded

Little thing I learned about #UBoot and its EXT4 support: it doesn't support 64-bit filesystems or metadata checksums.

The latter is a bit of a shame as it might detect some corruption issues, but the latter merely restricts the block device to 2TB. Who needs a `/boot` that big? (Or has the money for a ≥2TB MicroSD card?)

```
mkfs.ext4 -O ^64bit,^metadata_csum ${partition}
```

If you fail to do this, older U-Boot (2014-era) will just ignore the features and corrupt the filesystem. Newer U-Boot (2026-era) will refuse to write to the partition.

Now that I've got some free time… I had a look at the boot-loader for the TS-7670. I have an old port of U-boot from about 2017 or so… but that does not build with modern gcc, so I had a go at porting it.

No dice, it flatly refuses to boot… but I tried the `mx28evk` config: and *that* does… this is what I originally used for the TS-7670 port years ago, so maybe I need to circle back and have a look. Also Technologic Systems have got an official TS-7670 U-boot source tree too, so maybe I start bringing that up-to-date.

This is what I see on the console booting the `mx28evm` build of U-boot… sure doesn't find the SD card (probably because pin muxing is wrong), but it at least gives it a solid crack and does something.

```
HTLLCLLC

U-Boot 2026.04-00179-g5727c33705f1 (May 31 2026 - 19:30:14 +1000)

CPU: Freescale i.MX28 rev1.2 at 454 MHz
BOOT: SSP SD/MMC #0, 3V3
DRAM: 128 MiB
Core: 91 devices, 13 uclasses, devicetree: separate
NAND: 0 MiB
MMC: MXS MMC: 0
Loading Environment from MMC... MMC: no card present
*** Warning - No block device, using default environment

In: serial
Out: serial
Err: serial
Hit any key to stop autoboot: 0
MMC: no card present
MMC: no card present
Booting from net ...
Unknown command 'dhcp' - try 'help'
zimage: Bad magic!
```

#UBoot #iMX286 #Linux