Reset on Beaglebone Black has become unreliable/broken

[Konstantin Kletschke]

On Wed, Dec 04, 2024 at 12:07:44PM +0100, Konstantin Kletschke wrote:

> This is an unaffected Board (warm restart works):
> 
> barebox at TI AM335x BeagleBone black:/ i2c_read -b0 -a 0x24 -r 0 -c 0x1e
> 0xe2 0x3e 0x01 0x01 0xb1 0x80 0xb2 0x01 0x00 0x00 0x04 0x00 0x7f 0x0c 0x18 0x08 0x08 0x06 0x09 0x38 0x26 0x3f 0x7f 0x00 0x03 0x15 0x5f 0x32 0x40 0x20
> barebox at TI AM335x BeagleBone black:/ i2c_read -b0 -a 0x24 -r 0 -c 0x1e
> 0xe2 0x3e 0x00 0x01 0xb1 0x80 0xb2 0x01 0x00 0x00 0x04 0x00 0x7f 0x0c 0x18 0x08 0x08 0x06 0x09 0x38 0x26 0x3f 0x7f 0x00 0x03 0x15 0x5f 0x32 0x40 0x20

This is the same BBB, unaffected, read out with its shipped u-boot
(U-Boot 2019.04-00002-g31a8ae0206):

=> i2c md 0x24 0x0 0x1e
0000: e2 3f 01 01 b1 80 b2 01 00 00 04 00 7f 0c 18 11    .?..............
0010: 08 06 09 38 26 3f 7f 00 03 15 5f 32 40 20    ...8&?...._2@
=> i2c md 0x24 0x0 0x1e
0000: e2 3f 00 01 b1 80 b2 01 00 00 04 00 7f 0c 18 11    .?..............
0010: 08 06 09 38 26 3f 7f 00 03 15 5f 32 40 20    ...8&?...._2@
=> i2c md 0x24 0x0 0x1e
0000: e2 3f 00 01 b1 80 b2 01 00 00 04 00 7f 0c 18 11    .?..............
0010: 08 06 09 38 26 3f 7f 00 03 15 5f 32 40 20    ...8&?...._2@

Command issued three times, in address 0x2 also transition from 1 to 0
on second read.

Differences in 
PPATH (barebox: 0x3e, u-boot: 0x3f) and
DEFDCDC2 (barebox: 0x08, u-boot: 0x11)

Wondering if this could be significant...

Regards
Konsti


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