Hi Bernd, > > I notice you forgot the --8086 when running UPX! > > You could also use --ultra-brute instead of --best but that > > is slower and it is UPX 2.0 incompatible so it should be the > > non-default option if you ask me.
> Be carefull with UPX 3.01, their forums mention the switches have > become a big mess and thus some options dont work. Thanks for the warning, I prefer UPX 2 for now then anyway ;-) > I wonder how the LZMA compression works on the kernel > (likely 386-only due to compression method?). LZMA is indeed 386 only afair, and needs some extra memory. It uses a two pass decompression with two stubs, so I doubt that it would be easily possible to convince a LZMA packed kernel that it is not a kernel but something supported by UPX. > Might be best to wait for 3.02 sometime :) Maybe, yes. > Btw what happens if 386-kernel is run on a pre-386 It will crash at once. Maybe we should add a check, but of course this still will not help if you use a compression method which has an 8086-incompatible stub. The --8086 UPX option only adds a few bytes, so you should always use it. Note that even the LBA FAT32 boot sector needs a 386, which is probably okay. The CHS FAT32 boot sector is a miracle of small 8086 code so it is 8086 compatible and fits in 512 bytes. The LBA FAT32 boot sector will simply crash on pre-386. > or a kernel without fat32 support run on a fat32 partition? Such a kernel will ignore all FAT32 drive letters as it will not know that they are DOS drives at all. If you boot such a kernel from a FAT32 partition, it will fail to read config sys or command com from the partition, but might read it from another, FAT16, partition or maybe even from A: instead :-). Please test that. It is basically okay if a kernel cannot read the filesystem where it came from (you could even start it without one) but of course there should be a warning if it cannot find any DOS filesystem at all... Eric ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Freedos-devel mailing list Freedos-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/freedos-devel
