Hello again,
I still have doubts, I'm trying to write the fuses directly through the boot and write the MACs (from the image, extracted from the security manual) and I don't know where the lock fuse is to enable them, I can only read them, but I can't write.
this?
Yes, that command.
There is a lock bit field for MAC address fuses that is:
COM_DEVICE_ID1_LOCK in bank 0 word1 bit [6~8] and the behavior is as mentioned on the next image.
Could you please confirm?
Best regards.
Thanks for the response again,
I have read the BANK 0 WORD 1 and I have 2493, I have been able to observe the bits that you indicate and I see that I have it protected, should I write 000 at this address? that is 2413?
I can't write these fuses, any other solution please?
Hello,
Have you blown those fuses before?
I read them from EVK boards (A0 and A1 silicon revision), and the default value is the next:
Unfortunately, I cannot burn eFuses on our EVK boards, since we use them to test.
Best regards.
Hello,
I think that error is related to the offset.
On i.MX 93 one bank is equals to 8 words, so a bank cannot be more than 8 words, in the fuse map attached to the i.MX93 RM, “Bank 3 word 24” in reality is Bank 3 word 0, here a part of the correct order:
Here a small table to understand the offsets:
In the “i.MX Linux User's Guide”, section “13.2 NVMEM provider OCOTP”, says that “The 2nd parameter is from the first data in property reg of a NVMEM consumer, and this offset represents the OCOTP shadow register, to which a eFuse address is mapped.”, so the offset of the first word of each Bank is the number of the Bank times 0x20, for example if you want to kwon the offset of Bank 3 Word 0, the offset is 3 * 0x20 = 0x60, if you want to know the offset of Bank 1 Word 1, the offset is (1 * 0x20) + 4 = 0x24, offset of Bank 2 Word 3 = (2 * 0x20) + (0x4 * 0x3) = 0x4C.
Best regards.
Hello,
Thank you for the quick reply JorgeCas!
I understand what you are saying, but I am struggling to find the right offset value for the MAC addres 1 and 2. In the IMX93 fusemap document there is some flags with specific bank addres and word offset and other like the MAC are "Packed_FuseIndex":
Should I just divide the "Packed_FuseIndex" by 32 to get the offset?
Still getting the permissions problem with all the test done. I can read without any problem the fuses but can't write yet.
No, I don't. I have requested it but I haven't been granted access.
The formula for get the offset (Bank number * 8 + word) 39*8 + 317 = 629 that is very far away from 10144 :`)
I have attached in the DTS the following declarations:
