i.MX8 ULP fuse question

[ddresser]

I am trying to use a secure boot.  From u-boot, it appears to me that the fuse only has room for 8 words for the SRK Hash.  If I try to read a 9th word, I get an error.  Is it true that I can only burn a 256bit hash in the fuses on a i.MX8ULP board?

=> fuse read 15 0 8

Reading bank 15:

Word 0x00000000: 9480ad14 7fc5bfc2 53f73ee8 fbf4341d

Word 0x00000004: 6a7c4bc1 9a415d07 bf28617b ca922e4c

=> fuse read 15 0 9

Reading bank 15:

Word 0x00000000: 9480ad14 7fc5bfc2 53f73ee8 fbf4341d

Word 0x00000004: 6a7c4bc1 9a415d07 bf28617b ca922e4c

Word 0x00000008:ERROR

This is the signature block from my image.  It shows a 512 bit (16 word) hash, which seems to be the default in the Yocto build.  What do I need to do to make them work together?

Signature block:

    offset.......... 0x590

    length.......... 400 (0x190)

    SRK table:

        offset.......... 0x5a0

        length.......... 308 (0x134)

        SRK Table records:

            signature algo.. ECDSA

            hash algorithm.. sha384

            key size/curve.. secp256r1

            curve len....... 32 (0x20)

            SRK 1 record:

                ** SRK record being used **

                offset.......... 0x5a4

                length.......... 76 (0x4c)

            SRK 2 record:

                offset.......... 0x5f0

                length.......... 76 (0x4c)

            SRK 3 record:

                offset.......... 0x63c

                length.......... 76 (0x4c)

            SRK 4 record:

                offset.......... 0x688

                length.......... 76 (0x4c)

        SRK Hash fuses:

            fuse word  0.... 0x0b2f3e4a

            fuse word  1.... 0x3fd5a13e

            fuse word  2.... 0x8bf5dca6

            fuse word  3.... 0xddc16c2f

            fuse word  4.... 0xf63c34db

            fuse word  5.... 0x6a0267b3

            fuse word  6.... 0x45cc92e2

            fuse word  7.... 0x33d1b23b

            fuse word  8.... 0xb6254a49

            fuse word  9.... 0x8d43a32b

            fuse word 10.... 0x12874d17

            fuse word 11.... 0x90bd1a25

            fuse word 12.... 0x5986bf7b

            fuse word 13.... 0xe552a0a1

            fuse word 14.... 0xabff4bd0

            fuse word 15.... 0xff7f6992

[LFGP]

dear @ddresser,
please use the procedure I mentioned in your next post

https://community.nxp.com/t5/i-MX-Processors/i-MX8-ULP-secure-boot-questions/td-p/2034629