First of all, I'm sorry for my poor English skill.
But I'm eager to make my IXY 2000IS available to save RAW format.
I can't find IXY 2000IS or the same model having other model name except in canon.jp. So, I guess that IXY 2000IS is sold only in Japan.
I tried all released CHDK firmwares with my IXY 2000IS. However I couldn't succeed to see 'firmware update...' menu.
Then I tried to dump the original firmware of IXY 2000IS and managed to get about 4MB data beginning with 'gaonisoyP' string.
Did I succeed to dump the firmware?
If so, please add IXY 2000IS to the supported list of CHDK
Because I'm not familiar with arm architecture, I can't disassemble and understand.
Dump I got is here.
http://rio.tc/temp/2000is.dump.zip