Peter de Young

i.MX35 IIM fuse access limited to 32 rows

Discussion created by Peter de Young on Aug 7, 2012
Latest reply on Aug 16, 2012 by Peter de Young

I am running 2.6.31 Linux on a i.MX35 board and I'm trying developing some software to access the IIM fuses. I have been able to program, sense and read the lower 32 fuse rows in each bank, but when I try to sense fuse in rows 32 - 256 of the banks, I get SDAT data that is set to the same value as the last valid value read from the rows 1 - 32. I have also tried to read the memory directly and for the first 32 fuses I retrieve data identical to that read by sensing, but when I try and access higher locations I get a bus error.

It would appear that any fuses that have a row address that has any of the three top address bits set do  not work, that is those defined in the bottom three bits of the UA register.

I have tried the sample code given with the IIM documentation and the results are the same.

Has anybody else had similar issues and have a possible solution or work around?