On Fri, May 2, 2008 at 12:24 PM, Denver Gingerich <[EMAIL PROTECTED]> wrote: > On Fri, May 2, 2008 at 12:12 PM, C. Scott Ananian <[EMAIL PROTECTED]> wrote: >> >> On Thu, May 1, 2008 at 10:52 PM, Denver Gingerich <[EMAIL PROTECTED]> wrote: >> > When booting 2.6.25 master kernels (specifically seen on 20080501.2 >> > and 20080501.3) from an SD card, the following error occurs every 5th >> > boot or so: >> > >> > [ 3.512185] Waiting 2sec before mounting root device... >> > [ 5.574603] VFS: Cannot open root device "mmcblk0p1" or >> unknown-block(0,0) >> > [ 5.577210] Please append a correct "root=" boot option; here are the >> > available partitions: >> > ... >> > [ 5.747213] Kernel panic - not syncing: VFS: Unable to mount root fs >> > on unknown-block(0,0) >> > [13.597220] mmc0: Timeout waiting for hardware interrupt. >> > >> > I have never encountered this error using 2.6.22-20071121.7 with over 50 >> boots. >> >> Does increasing rootdelay help? ie, is the problem that setting up SD >> is now taking (say) 1.5-2.5 seconds instead of 1-2 seconds, and so >> sometimes the SD card is not present after the 2 second rootdelay? > > I can give it a shot, but I don't think it will help. > 2.6.22-20071121.7 always ran fine with rootdelay=1 and when I first > got the mounting problem on 2.6.25 I increased it to rootdelay=2. But > the mounting problems continued after making that change. The type of > error (mmc0 timeout) suggests that there are communication problems > with the SD controller that would prevent the kernel from finding the > partition table, even after waiting 10 seconds (the apparent length of > the timeout given the timestamps).
This problem is also present in the latest master kernel (2.6.26-rc3). The kernel log is the same as with the 2.6.25 kernels and it appears to happen about as often. The problem appears to occur with high probability after a cold boot (where the XO has been off for a couple hours and has justed been turned on). It also happens periodically during other boots; it just seems more likely to occur after a cold boot. Denver _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
