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@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..@.....
> 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@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@xxxxxxxxxxxxxx>
| 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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