On 11/09/2017 08:14 AM, Richard Schmitt wrote: > Using a 4.9 kernel, trying to boot a kernel using an eMMC based rootfs will > result in a crash > > The message preceeding the crash is: > > [ 3.285566] VFS: Cannot open root device "mmcblk0p9" or > unknown-block(0,0): error -6 > [ 3.293338] Please append a correct "root=" boot option; here are the > available partitions: > > Our kernel boot args can be seen in the boot log but for easy reference are: > > root=/dev/mmcblk0p9 earlycon clk_ignore_unused cpuidle.off=1 DEBUG_MODE=y > siq_board_type=RP maxcpus=1 > > Note that we do specify root=/dev/mmcblk0p9. If I simply remove maxcpus=1 > from the kernel boot args, the system will boot up fine. > > Seems like there might be a race in bringing up the eMMC partitions prior to > mounting the rootfs but I don’t want to hypothesis any further. > > Any ideas?
If you suspect a timing issue, an easy test would be to add to the kernel boot/command line either: rootwait or rootdelay=10 (in seconds) to see if that helps. or send email to linux-arm-ker...@lists.infradead.org ... -- ~Randy
