Electronics > Repair
Agilent 34461A corrupted flash
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tv84:
Having fun without me??

I'm almost sure I know how to calc that CRC/checksum.
ElectronMan:

--- Quote from: tv84 on July 30, 2023, 11:29:21 pm ---Having fun without me??

I'm almost sure I know how to calc that CRC/checksum.

--- End quote ---

What I am looking at actually appears to be a bad-block check.

As an example:


--- Code: ---           00 01 02 03 04 05 06 07  08 09 0A 0B 0C 0D 0E 0F
           XX XX          XX XX XX                 XX XX XX
87FFB708 = FF FF FF FF FF FF FF FF  95 A5 6A 69 59 FF FF FF
--- End code ---
If any of the bytes marked with X's from the first 16 bytes of Spare are not FF, it bails with an error.
analogRF:

--- Quote from: tv84 on July 30, 2023, 11:29:21 pm ---Having fun without me??

I'm almost sure I know how to calc that CRC/checksum.

--- End quote ---

so finally dragged you into this  >:D >:D
ElectronMan:
Okay. So I just noticed something. This is likely why our spares are not matching up... It appears you have a different flash chip with internal ECC, while I do not.

Maybe a cost-cutting change Keysight made before I bought mine. Did you see what flash chip you have in there?

Mine:
CPU:   SPEAr320
DRAM:  128 MiB
Unknown id: 0xffffff. Using ST_M23P40
Flash: 64 KiB
NAND:  fsmc-ecc1 128 MiB
In:    serial
Out:   serial
Err:   serial
SerNum:MY99999999
Chip:  AA Board Rev: 4
init  RTC: 2023-07-30 18:12:44.22
Net:   No ethernet found.
splash RTC: 2023-07-30 18:12:45.25

Yours:
CPU:   SPEAr320
DRAM:  128 MiB
Unknown id: 0xffffff. Using ST_M23P40
Flash: 64 KiB
NAND:  INTERNAL ECC 128 MiB
In:    serial
Out:   serial
Err:   serial
SerNum:MY99999999
Chip:  AA Board Rev: 4
init  RTC: 2023-07-28 15:47:59.57
Net:   No ethernet found.
splash RTC: 2023-07-28 15:48:00.60
analogRF:
NAND chips on both of my meters are Micron MT29F1G08ABADAH4-ITX:D  marked NQ432
both are identified in uboot as INTERNAL ECC 128 MiB
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