On 04/17/2015 02:43 AM, Robert Baldyga wrote: > This patch fixes problems with serial console break. When function > s3c64xx_serial_startup() was started while serial console has been working, > it caused lose of characters written to TX FIFO. This effect was particularly > observable with systemd, which closes serial port every time when it's > not currently needed, hence function s3c64xx_serial_startup() is called > quite often there. To fix this problem we avoid resetting TX FIFO if port is > used as serial console. > > Example of broken console log: > > [ 1086.7 Expecting device dev-ttySAC1.device... > [ 1086.[ OK ] Reached target Paths. > [ 1086.756416] s[ OK ] Reached target Swap. > [ 1086.776413] systemd[1]: Reached target Swap. > [ 1086.776642] systemd[1]: Starting Root Slice. > [ 5.53403[ OK ] Created slice Root Slice. > [ 5.548433] systemd[1]: Create[ OK ] Created slice User and Session > Slice. > [ 5.568414] sys[ OK ] Listening on /dev/initctl Compatibility Named Pipe. > [ 5.588388] s[ OK ] Listening on Delayed Shutdown Socket. > [ 5.608376] sy[ OK ] Listening on Journal Socket (/dev/log). > [ 5.628361] [ OK ] Listening on udev Kernel Socket. > [ 5.648357] s[ OK ] Listening on udev Control Socket. > [ 5.668353] s[ OK ] Listening on Journal Socket. > [ 5.688366] systemd[1]: Listeni[ OK ] Created slice System Slice. > [ 5.708393] Mounting Temporary Directory... > [ 7139.067436] Starting prepare device daemon... > [ 7139.091726] sy Starting Generate environment from /etc/profile.d... > [ 5.792867] system Starting Create Static Device Nodes in /dev... > [ 7848.718 Mounting Debug File System... > [ 7848.7384 Mounting Configuration File System... > [ 5.852 Starting Apply Kernel Variables... > [ 5.8720 Starting Setup Virtual Console... > [ 7848.798 Starting udev Coldplug all Devices... > [ 7848.817 Starting Journal Service... > [ OK ] Started Journal Service. > [ 7848.854222] s[ OK ] Reached target Slices. > Starting Remount Root and Kernel File Systems... > [ OK ] Mounted Configuration File System.
Reviewed-by: Peter Hurley <pe...@hurleysoftware.com> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
