memtest failed for rk3588

[Sascha Hauer]

On Tue, Dec 10, 2024 at 02:29:59PM +0300, Alexander Shiyan wrote:
> Hello.
> 
> The dump does not cause a crash, but the output is very strange:
> 
> barebox at Diasom DS-RK3588-BTB-EVB:/ md 0x3fc000100
> 3fc000100: 940033fd b0000060 39477ea1 91274c00               .3..`....~G9.L'.
> 3fc000110: 17ffffe2 91404001 b9428020 37f80180               .....@@. .B....7
> 3fc000120: b9428020 32010000 b9028020 52800020                .B....2 ... ..R
> 3fc000130: b9420822 32000042 b9020822 b9420822               ".B.B..2"...".B.
> 3fc000140: 521c0042 b9020822 d65f03c0 52800000               B..R"....._....R
> 3fc000150: 17fffff8 91404000 34000081 b9428001               .....@@....4..B.
> 3fc000160: 12007821 b9028001 b9420801 121f7821               !x........B.!x..
> 3fc000170: b9020801 b9420801 521c0021 b9020801               ......B.!..R....
> 3fc000180: d65f03c0 d37b7c21 71000c5f 8b010000               .._.!|{._..q....
> 3fc000190: 528aaaa1 72bdddc1 f9400400 b900ac01               ...R...r.. at .....
> 3fc0001a0: 529dddc1 72aaaaa1 b90a7c01 b94a2401               ...R...r.|...$J.
> 3fc0001b0: 321c0021 b90a2401 b94a2403 12147463               !..2.$...$J.ct..
> 3fc0001c0: 54000300 52808001 1ac22022 2a030042               ...T...R" ..B..*
> 3fc0001d0: b90a2402 b94a2401 32000021 b90a2401               .$...$J.!..2.$..
> 3fc0001e0: b94a2401 360fffe1 b94a2401 121f7821               .$J....6.$J.!x..
> 3fc0001f0: b90a2401 b94a2401 12147421 b90a2401               .$...$J.!t...$..
> barebox at Diasom DS-RK3588-BTB-EVB:/ md 0x3fc000200
> 3fc000200: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000210: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000220: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000230: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000240: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000250: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000260: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000270: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000280: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc000290: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc0002a0: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc0002b0: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc0002c0: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc0002d0: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc0002e0: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................
> 3fc0002f0: xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx               ................

See:

| commit d8a6e1c2662aad2f5d9b4050a276b8e6b9fbb3b1
| Author: Jan Luebbe <jlu at pengutronix.de>
| Date:   Sun Aug 3 17:51:38 2014 +0200
| 
|     ARM/mem: handle data aborts gracefully for md
| 
|     Sometimes memory ranges contain inaccessible registers which trigger a
|     data abort when accessed. To handle this gracefully, we extend the data
|     abort exception handler to ignore the exception when configured to do
|     so.
| 
|     This allows detecting inaccessible memory from the md command. It will
|     show XX for unreadable bytes instead.

I don't know why you get a data abort here. The answer is probably
somewhere in the DMC section of the RK3588 reference manual.

Sascha

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