"end_request: I/O Error" when formatting emmc partition

Technical Support
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1

Every time a partition on the emmc is formatted using mkfs.ext3 the kernel prints at least 2 errors of the form “end_request: I/O Error, dev mmcblk0, sector #”.

I have traced the error to the mmc_erase() function in the kernel returning EOPNOTSUPP. It looks like the erase is possibly not happening but the partition seems to work ok.

Can I ignore these errors?

2

I also noticed this at one point but dismissed it as one of them obsolete kernel issues. Anyway, we have not heard of or seen any further issues this would have caused. So as such you may just ignore this errors. BTW: On TK1 one should anyway be using ext4 instead.