From mboxrd@z Thu Jan 1 00:00:00 1970 From: linux@arm.linux.org.uk (Russell King - ARM Linux) Date: Fri, 8 Jan 2016 23:44:32 +0000 Subject: bcm4708-smartrg-sr400ac boot failures in next/arm-soc In-Reply-To: References: <20160108225032.GO19062@n2100.arm.linux.org.uk> Message-ID: <20160108234432.GQ19062@n2100.arm.linux.org.uk> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Jan 08, 2016 at 03:17:19PM -0800, Tyler Baker wrote: > On 8 January 2016 at 14:50, Russell King - ARM Linux > wrote: > > On Fri, Jan 08, 2016 at 02:33:39PM -0800, Tyler Baker wrote: > >> After a bit of investigation, I determined that CONFIG_BLK_DEV_RAM was > >> causing the issue and disabling it fixed the boot issue. Essentially, > >> the kernel cannot find the initrd that has been loaded into memory by > >> CFE bootloader with this option enabled as I inject the following > >> command line into the DT before it's loaded over tftp. > >> > >> Loaded in CFE by: 'load -raw -tftp -addr=0x4000000 -max=0x900000 > >> 192.168.2.2:tmpqC9zOv/ramdisk.cpio.gz' > >> > >> Kernel arguments injected into DT: 'console=ttyS0,115200 > >> initrd=0x4000000,8M root=/dev/ram0 ip=dhcp' > > > > What is the problem that the kernel is reporting? > > The kernel complaining that there is no file system to mount, and > panics. Here is a plain text version of the issue if you want to have > a look[1]. Thanks. The error is: [ 16.557922] RAMDISK: EOF while reading compressed data which is not surprising given: initrd=0x4000000,8M is given on the kernel command line, but: Loader:raw Filesys:tftp Dev:eth0 File:192.168.2.2:tmpd9L7xr/ramdisk.cpio.gz Options:(null) ... 8450989 bytes read the actual ramdisk is larger than 8M. 8M would've been 8388608 bytes, but you're about 64k over that. Hence, the decompression into /dev/ram0 fails when BLK_DEV_RAM is enabled (that decompressor strictly follows the initrd limit), which then goes on to cause the failure to mount the rootfs. -- RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net.