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| /freebsd-11-stable/sys/arm/arm/ | ||
| H A D | pmap-v4.c | diff 283014 Sat May 16 19:30:00 MDT 2015 imp Don't allow unmapped I/O. The pmap isn't quite up to the task. Add a comment to this effect and switch the default. My old AT91SAM9G20 now boots, fsck's the SD card and runs w/o an issue for the first time since a 9.1-ish stable build I did a few years ago. Problems with unmapped I/O: o un-page-aligned I/O requests to devices fail (notably fsck and newfs). o write-back caching was totally broken. write-through caching needed to be enabled. o Even page-aligned I/O requests sometimes failed for reasons not thoroughly investigated. Suggested by: ian@ MFC after: 2 days |
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