> Date: Sat, 30 Apr 2016 13:31:21 +0200 (CEST) > From: Mark Kettenis <[email protected]> > > > From: John Troy <[email protected]> > > Date: Fri, 29 Apr 2016 11:56:24 -0400 > > > > On 4/28/16 2:30 PM, Mark Kettenis wrote: > > > So here are just the bits that add DMA support. Since Theo likes this > > > so much, I'd like to move forward with this. > > > > > > ok? > > > > > Hi Mark, > > This diff seems to break things on my Lenovo Ideapad 100s. The 100s has > > an internal eMMC and a microSD card slot. As far as I can tell, reading > > from a microSD card breaks both eMMC and microSD. > > > > Reading from the eMMC, twice for good measure: > > # dd if=/dev/rsd0c of=/dev/null bs=1M count=1 > > 1+0 records in > > 1+0 records out > > 1048576 bytes transferred in 0.191 secs (5486853 bytes/sec) > > # dd if=/dev/rsd0c of=/dev/null bs=1M count=1 > > 1+0 records in > > 1+0 records out > > 1048576 bytes transferred in 0.190 secs (5506851 bytes/sec) > > > > Reading from the microSD: > > # dd if=/dev/rsd1c of=/dev/null bs=1M count=1 > > dd: /dev/rsd1c: Input/output error > > 0+0 records in > > 0+0 records out > > 0 bytes transferred in 3.019 secs (0 bytes/sec) > > > > Reading from the eMMC again: > > # dd if=/dev/rsd0c of=/dev/null bs=1M count=1 > > dd: /dev/rsd0c: Input/output error > > 0+0 records in > > 0+0 records out > > 0 bytes transferred in 0.004 secs (0 bytes/sec) > > > > At this point the system is unusable, and there's nothing else > > interesting in dmesg. > > Can reproduce this on the Lenovo stick, which is in many ways very > similar to the 100s. So far I've not found a solution. > > Since the diff gives significant improvements and seems to be > completely stable if I leave the SD card slot empty, I've committed it > anyway. You may want to revert the changes to dev/acpi/sdhc_acpi.c > for now if you intend to use the SD card slot on the 100s. > > Hopefully I'll figure out what the problem is soon. Otherwise I might > selectively disable DMA support on this hardware.
Found the problem. Should be fixed with: CVSROOT: /cvs Module name: src Changes by: [email protected] 2016/05/01 11:13:55 Modified files: sys/dev/sdmmc : sdhc.c Log message: Always write block count. This fixes the DMA issues on Bay Trail.
