Hi Guru's
I successfully builf my own kernel abd run it for arm64, I try now to do the same trick with arm32.
I need to have a root fs bigger enough to do basic dev in c user code.
I choose latest raring-developper for this. DL vexpress-raring_developer_20130826-443.img.gz
I can then mount it and extract vmlinuz and initrd then boot it like given on some doc pages
qemu-system-arm \ -kernel vmlinuz \ -sd vexp.img \ -M vexpress-a9 \ -cpu cortex-a9 \ -serial stdio \ -m 1024 \ -initrd initrd \ -append 'root=/dev/mmcblk0p2 rw mem=1024M raid=noautodetect console=ttyAMA0,38 400n8 rootwait vmalloc=256MB devtmpfs.mount=0'
From there I got a prompt
root@linaro-developer:~# uname -a Linux linaro-developer 3.11.0-1-linaro-vexpress #1ubuntu1~ci+130822051821-Ubuntu SMP Thu Aug 22 05:54:20 UTC 201 armv7l armv7l armv7l GNU/Linux root@linaro-developer:~# df Filesystem 1K-blocks Used Available Use% Mounted on /dev/mmcblk0p2 963288 652056 245084 73% / udev 514152 4 514148 1% /dev tmpfs 103060 172 102888 1% /run none 4 0 4 0% /sys/fs/cgroup none 5120 0 5120 0% /run/lock none 515280 0 515280 0% /run/shm none 102400 0 102400 0% /run/user
I need more disc space for doing dev, so I investigated 2 options
1) Make the rootfs bigger I truncate 4G the rootfs.img (rootfs.img is a short for vexpress-raring_developer_20130826-443.img) then I losetup the rootfs.img and use gparted to extend the ext4 partition.
Alas next reboot fail, a bit like if /dev/mmcblk0p2 has an hardcoded size...
2) have an extern (user data) disc, and have it mounted So I trucate phi.img 4G, mkfs it, and try to mount it, but I got no idea what /dev to use to mount it, and got no idea what could be given in the qemu runstring to ask for one more disc in the HW description.
Later on I would need to boot my own kernel, I tried the build from source path, all goes fine and I can get an Image a uImage etc, so I guess it will be a matter of providing this the vmlinus I get along with the initrd I got from teh rootfs.img, will see how it goes. But for now my problem is really to have more disc space either in rootfs ot in an additional disc.
Any help appreciated.
Cheers, Phi