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| /freebsd-11.0-release/sys/dev/syscons/ | ||
| H A D | syscons.c | diff 25190 Sun Apr 27 09:03:10 MDT 1997 yokota Addresses the following two problems. 1) i586_bcopy() problem There have been a number of reports that the syscons doesn't work properly if i586_bcopy() is enabled. The problem prevented users from installing 2.2(.1)-RELEASE. The symptom is that the system looks frozen during device probe or just before the main installation menu. The workaround was to specify the flag 0x01 to the npx device so that i586_bcopy() is disabled. The patch forces the syscons to call generic_bcopy() when copying to/from the video memory, even if CPU is Pentium and i586_bcopy() is enabled. i586_bcopy() is still called for copy operations between non-video memory regions. PR: kern/2277, kern/3066, kern/3107, kern/3134 2) video mode parameter table problem The syscons reads and uses the video mode parameter table provided by the VGA BIOS to set VGA registers when changing video mode and modifying font data. It appears that in some VGA BIOSes the table is not ordered as the syscons expects, and this leads to screen corruption. The problem prevented users from installing 2.2(.1)-RELEASE. The symptom is the corrupt screen or strange vertical lines soon after the kernel is loaded into memory (just after the kernel decompression). The patch performs simplistic test and if it fails, set video_mode_ptr to NULL so that the video mode switching won't happen. This is an interim kludge. There should be a better way to deal with the problem. PR: kern/2498, conf/2775, conf/3354 Reviewed by: sos Tested by: PR originators (not all of them, though) |
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