This appears to be corrupt:
ROM:FF810088 10 0F 11 EE MRC p15, 0, R0,c1,c0
ROM:FF81008C 01 0D 0A 80 ANDHI R0, R10, R1,LSL#26
ROM:FF810090 E3 04 00 80 ANDHI R0, R0, R3,ROR#9
ROM:FF810094 E3 01 00 80 ANDHI R0, R0, R3,ROR#3
ROM:FF810098 E3 10 0F 01 SMLATTEQ PC, R3, R0, R1
ROM:FF81009C EE 19 11 A0 ANDGES R1, R1, LR,ROR#19
edit:
this dump:
zSHARE - sx100-1.00b-firmware.zip found on:
SX100IS - CHDK Wiki appears to correct.
edit:
I loaded the above ROM at the wrong address, but it doesn't change the fact that it's broken 😖