I send Ralf a fix a couple of weeks ago, which introduced the byteswapping, which really is necessary. This fix is probably only necessary for bigendian systems with large IDE disks (>8GB), which support LBA mode. I send this patch over a year ago. I discovered that when I ran on a disk, which was larger than 8GB, it was only treated as 8GB. The problem with the fix is, it is not backward compatible. After the fix I needed to reinstall my bigendian system. As I told Ralf, this fix will be a pain for everyone, but I guess we need the fix eventually. If you don't want to reinstall your system then get rid of the code in the "ifdef __MIPSEB__" statements in include/asm-mips/ide.h /Carsten Ken Aaker wrote: > I've just run across an interesting problem building a big-endian MIPS > kernel against the kernel source from the cvs tree. When the drive > identity record is presented to the ide_fix_driveid() function in > include/asm-mips/ide.h, it looks like its been byteswapped in 16 bit > chunks. Needless to say, this causes a certain amount of confusion. I > tried following the process back to the point where the data is read in, > but I failed to find anything that seemed to be explicitly swapping the > code. The older kernel that I have 2.4.3 works Ok, so it's something > that's happened recently. Here's a little bit of debug information that > I collected.. I messed around with the ide_fix_driveid function till I > got the system to work, but I'm be embarassed to see that code escape > into the wild. > > This is a dump of the id record before the call to ide_fix_driveid() in > the 2.4.3 kernel. > 0000: 7a42ff3f 00001000 00e15802 3f001000 "zB.?......X.?..." > 0010: 00000e00 4457572d 41435441 34343430 "....DWW.ACTA4440" > 0020: 33340034 00000000 03000010 28003630 "34.4..........60" > 0030: 302e4734 36304457 20434457 30334530 "0.G460DW.CDW03E0" > 0040: 2d423030 50433046 20202020 20202020 ".B00PC0F........" > 0050: 20202020 20202020 20202020 20201080 "................" > 0060: 0000002f 01408002 00000700 ff3f1000 ".....@.......?.." > 0070: 3f0010fc fb000001 80ac7e03 00000704 "?.........~....." > 0080: 03007800 78007800 78000000 00000000 "..x.x.x.x......." > 0090: 00000000 00000000 00000000 00000000 "................" > 00a0: 3e000000 6b34014b 00406934 01080040 ">...k4.K.@i4...@" > 00b0: 3f000000 00000000 00004b60 fe800000 "?.........K`...." > 00c0: 00000000 00000000 00000000 00000000 "................" > 00d0: 00000000 00000000 00000000 00000000 "................" > 00e0: 00000000 00000000 00000000 00000000 "................" > 00f0: 00000000 00000000 00000000 00000000 "................" > 0100: 01000000 00000000 00003300 00000000 "..........3....." > 0110: 00000000 00000000 00000000 00000000 "................" > 0120: 00000000 00000000 00000000 00000000 "................" > 0130: 00000000 00000000 00000000 00001f00 "................" > 0140: 00000000 00000000 00000000 00000000 "................" > 0150: 00000000 00000000 00000000 00000000 "................" > 0160: 00000000 00000000 00000000 00000000 "................" > 0170: 00000000 00000000 00000000 00000000 "................" > 0180: 00000000 00000000 00000000 00000000 "................" > 0190: 00000000 00000000 00000000 00000000 "................" > 01a0: 00000000 00000000 00000000 00000000 "................" > 01b0: 00000000 00000000 00000000 00000000 "................" > 01c0: 00000000 00000000 00000000 00000000 "................" > 01d0: 00000000 00000000 00000000 00000000 "................" > 01e0: 00000000 00000000 00000000 00000000 "................" > 01f0: 00000000 00000000 00000000 0000a56e "...............n" > > This is a dump of the id record before the call to ide_fix_drived() in > the 2.4.18 kernel from cvs. > > 0000: 427a3fff 00000010 e1000258 003f0010 "Bz?........X.?.." > 0010: 0000000e 57442d57 43414154 34343034 "....WD.WCAAT4404" > 0020: 34333400 00000000 00031000 00283036 "434...........06" > 0030: 2e303447 30365744 43205744 33303045 ".04G06WDC.WD300E" > 0040: 422d3030 43504630 20202020 20202020 "B.00CPF0........" > 0050: 20202020 20202020 20202020 20208010 "................" > 0060: 00002f00 40010280 00000007 3fff0010 "....@.......?..." > 0070: 003ffc10 00fb0100 ac80037e 00000407 ".?.........~...." > 0080: 00030078 00780078 00780000 00000000 "...x.x.x.x......" > 0090: 00000000 00000000 00000000 00000000 "................" > 00a0: 003e0000 346b4b01 40003469 08014000 ".>..4kK.@.4i..@." > 00b0: 003f0000 00000000 0000604b 80fe0000 ".?........`K...." > 00c0: 00000000 00000000 00000000 00000000 "................" > 00d0: 00000000 00000000 00000000 00000000 "................" > 00e0: 00000000 00000000 00000000 00000000 "................" > 00f0: 00000000 00000000 00000000 00000000 "................" > 0100: 00010000 00000000 00000033 00000000 "...........3...." > 0110: 00000000 00000000 00000000 00000000 "................" > 0120: 00000000 00000000 00000000 00000000 "................" > 0130: 00000000 00000000 00000000 0000001f "................" > 0140: 00000000 00000000 00000000 00000000 "................" > 0150: 00000000 00000000 00000000 00000000 "................" > 0160: 00000000 00000000 00000000 00000000 "................" > 0170: 00000000 00000000 00000000 00000000 "................" > 0180: 00000000 00000000 00000000 00000000 "................" > 0190: 00000000 00000000 00000000 00000000 "................" > 01a0: 00000000 00000000 00000000 00000000 "................" > 01b0: 00000000 00000000 00000000 00000000 "................" > 01c0: 00000000 00000000 00000000 00000000 "................" > 01d0: 00000000 00000000 00000000 00000000 "................" > 01e0: 00000000 00000000 00000000 00000000 "................" > 01f0: 00000000 00000000 00000000 00006ea5 "..............n." > > -- > work -> kenaaker@silverbacksystems.com (507) 289-6910 ext 1 > home -> kenaaker@screaminet.com -- _ _ ____ ___ Carsten Langgaard Mailto:carstenl@mips.com |\ /|||___)(___ MIPS Denmark Direct: +45 4486 5527 | \/ ||| ____) Lautrupvang 4B Switch: +45 4486 5555 TECHNOLOGIES 2750 Ballerup Fax...: +45 4486 5556 Denmark http://www.mips.com
