On my current design, I cannot write the efuse reliably, but I can
write the hfuse and lfuse. I'm using an AVR Dragon with a AT90PWM3B.
The AVR Dragon has the most recent firmware (version HW 0106 SW 0101
0109). I can write all the fuses reliably using AVR Studio 4.13 build
528. Do you have any suggestion on how to troubleshoot? I'm using
avrdude 5.4.
Thanks,
Shaun
$ avrdude -Pusb -cdragon_isp -ppwm3b -B99 -Uefuse:w:0xff:m
avrdude: AVR device initialized and ready to accept instructions
Reading | ################################################## | 100% 0.16s
avrdude: Device signature = 0x1e9383
avrdude: reading input file "0xff"
avrdude: writing efuse (1 bytes):
Writing | | 0%
0.00s ***failed;
Writing | ################################################## | 100% 0.43s
avrdude: 1 bytes of efuse written
avrdude: verifying efuse memory against 0xff:
avrdude: load data efuse data from input file 0xff:
avrdude: input file 0xff contains 1 bytes
avrdude: reading on-chip efuse data:
Reading | ################################################## | 100% 0.05s
avrdude: verifying ...
avrdude: verification error, first mismatch at byte 0x0000
0xff != 0x01
avrdude: verification error; content mismatch
avrdude: safemode: efuse changed! Was ff, and is now 1
Would you like this fuse to be changed back? [y/n] n
avrdude: safemode: Fuses OK
avrdude done. Thank you.
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