Why do I get general failure when I try to write the authentication key to the RPMB partition using mmc-utils

Question

When I try to write the authentication key to the device using

mmc rpmb write-key /dev/mmcblk0rpmb /opt/data/keyfile.txt

or

echo -n AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH | mmc rpmb write-key /dev/mmcblk0rpmb -

I get the following error message

RPMB operation failed, retcode 0x0001

Do you know that the reason could be?

Answer 1

Have you solved this problem? In Embedded Multi-Media Card (e•MMC) Electrical Standard (5.1)

6.6.22.4.1 Programming of the Authentication Key The Authentication Key is programmed with the Write Multiple Block command, CMD25. Prior to the command CMD25 the block count is set to 1 by CMD23, with argument bit [31] set as 1 to indicate Reliable Write type of programming. If block count has not been set to 1 and/or argument bit [31] has not been set to 1 then the subsequent Write Multiple Block command must fail and General Failure shall be indicated. Does it help?