What is the correct ret val?

[danielkucera]

I see following in my dmesg:

[655174.290234] rtsx_pci_sdmmc rtsx_pci_sdmmc.0: __mmc_blk_ioctl_cmd: cmd error -22
[655177.428399]  mmcblk0: p1

It's printed after calling:

        ret = ioctl(fd, MMC_IOC_CMD, &idata);

so I've added some debug printf:

        printf("write ret: %d\n", ret);

and the value is:

Writing new CID: 5d53424c32424d31013917ca53010459
write ret: -1
Success! Remove and reinsert SD card to check new CID.

But my CID is not changed.
What is the correct ret val for that ioctl?

[raburton]

That's a good question. Usually ioctl returns 0 on success, according to the man page, but when I wrote the code I was obviously expecting a non-zero return code to indicate success. -1 usually indicates an error for ioctl, so I assume that's not what I was getting when I wrote it, so I'd guess the correct response would be something greater than 0, probably just 1. I don't have anything suitable to test with at the moment, so can't try it out myself to tell you what I actually get, but perhaps someone else can have a go. On the other hand, you can see an error in dmesg (and the cid isn't changed) so it's obviously not working, so either your reader or card is probably incompatible.

[danielkucera]

Thank you. I switched to arduino to have better control about the card but it is not working.
This code:

  ret = card.cardCommand(SAMSUNG_VENDOR_OPCODE, 0xEFAC62EC); //enter vendor mode
  Serial.printf("enter vendor %d\n", ret);
  
  ret = card.cardCommand(SAMSUNG_VENDOR_OPCODE, 0xEF50); //unlock
  Serial.printf("unlock %d\n", ret);

  ret = card.cardCommand(SAMSUNG_VENDOR_OPCODE, 0x00DECCEE); //exit vendor mode
  Serial.printf("exit vendor %d\n", ret);

Produces:

Card CID: 9F5449202020202020345BA816BD3
enter vendor 4
unlock 4
exit vendor 4

4 status is most probably: uint8_t const R1_ILLEGAL_COMMAND = 0X04;

Do you know is it matters if we are in SPI or SD mode?