[flashrom] Re: reading is ok but writing fails

[Mike Banon]

Please tell me more about your connection setup. Is it done by ISP (in
system programming), i.e. a test clip? If your connection seems to be
reliable and the wires are short enough (ideally less than 10cm) :
some devices aren't working well with ISP, i.e. if the surrounding
circuits are too power hungry and as result there's a voltage drop.

On Thu, Dec 10, 2020 at 2:05 PM Cédric Vuillet  wrote:
> Hi,
>
> thanks for working on flashrom which seems to be great!
>
> I tried to use it in order to flash an NVidia GTX780M to put it in a iMac 2010 which has graphic issue today.
>
> I tried to flash it using a CH341A module.
>
> I was able to save rom in a file using flashrom on MacOS X.
>
> But I have a problem trying to write a new rom on that card.
>
> This is the result I got... Do you know if I must change jumpers or something on my CH341A controller. Or do you think this can be a plug issue on the chip ?
>
> Tell me if you want a more verbose log maybe...
>
> Thanks à lot!
>
> Ced
>
> flashrom -p ch341a_spi -w ~/Downloads/780M_BR2.rom
>
> flashrom v1.2 on Darwin 19.6.0 (x86_64)
>
> flashrom is free software, get the source code at https://flashrom.org
>
> Calibrating delay loop... OK.
>
> Found PMC flash chip "Pm25LD020(C)" (256 kB, SPI) on ch341a_spi.
>
> Reading old flash chip contents... done.
>
> Erasing and writing flash chip... FAILED at 0x00000000! Expected=0xff, Found=0x4e, failed byte count from 0x00000000-0x00000fff: 0xf85
>
> ERASE FAILED!
>
> Reading current flash chip contents... done. Looking for another erase function.
>
> FAILED at 0x00000000! Expected=0xff, Found=0x4e, failed byte count from 0x00000000-0x00000fff: 0xf85
>
> ERASE FAILED!
>
> Reading current flash chip contents... done. Looking for another erase function.
>
> FAILED at 0x00000000! Expected=0xff, Found=0x4e, failed byte count from 0x00000000-0x0000ffff: 0xf6c3
>
> ERASE FAILED!
>
> Reading current flash chip contents... done. Looking for another erase function.
>
> libusb: warning [darwin_transfer_status] transfer error: timed out
>
> cb_in: error: LIBUSB_TRANSFER_TIMED_OUT
>
> ch341a_spi_spi_send_command: Failed to read 4100 bytes
>
> libusb: warning [darwin_abort_transfers] aborting all transactions on interface 0 pipe 1
>
> Verification impossible because read failed at 0x0 (len 0x40000)
>
> ERASE FAILED!
>
> Reading current flash chip contents... done. Looking for another erase function.
>
> FAILED at 0x00000000! Expected=0xff, Found=0x4e, failed byte count from 0x00000000-0x0003ffff: 0x27c8d
>
> ERASE FAILED!
>
> Reading current flash chip contents... libusb: warning [darwin_transfer_status] transfer error: timed out
>
> cb_in: error: LIBUSB_TRANSFER_TIMED_OUT
>
> ch341a_spi_spi_send_command: Failed to read 4100 bytes
>
> libusb: warning [darwin_abort_transfers] aborting all transactions on interface 0 pipe 1
>
> Can't read anymore! Aborting.
>
> FAILED!
>
> Uh oh. Erase/write failed. Checking if anything has changed.
>
> Reading current flash chip contents... done.
>
> Good, writing to the flash chip apparently didn't do anything.
>
> Please check the connections (especially those to write protection pins) between
>
> the programmer and the flash chip. If you think the error is caused by flashrom
>
> please report this on IRC at chat.freenode.net (channel #flashrom) or
>
> mail [e-mail], thanks!
>
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