On Wed, Jun 28, 2017 at 10:48 PM, Shahbaz khan <shazalive@xxxxxxxxx> wrote: > Hi Alexander, > > On Wed, Jun 28, 2017 at 1:46 PM, Alexander Kapshuk > <alexander.kapshuk@xxxxxxxxx> wrote: >> >> I am trying to setup a build environment where I can run the kernel and >> see how the changes I have made to the kernel source work. >> My understanding, based on googling, is that it is common practice in the >> kernel community to use a virtualised environment for that purpose. >> What I have done so far is create a ramfs that is built into the kernel, >> as described here [1] and here [2]. >> >> [1] https://landley.net/writing/rootfs-howto.html >> [2] >> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/plain/Documentation/early-userspace/README?h=v4.12-rc7 >> >> a). I have generated a minimal initramfs_list file: >> scripts/gen_initramfs_list.sh -d >usr/initramfs_list >> Which looks like this: >> # This is a very simple, default initramfs >> >> dir /dev 0755 0 0 >> nod /dev/console 0600 0 0 c 5 1 >> dir /root 0700 0 0 >> # file /kinit usr/kinit/kinit 0755 0 0 >> # slink /init kinit 0755 0 0 >> slink /bin/sh busybox 777 0 0 >> file /init /bin/busybox 755 0 0 >> >> b). Set CONFIG_INITRAMFS_SOURCE: >> CONFIG_INITRAMFS_SOURCE="/home/sasha/linux/usr/initramfs_list" >> >> c). And had the kernel generate the initramfs image: >> make >> ... >> GEN usr/initramfs_data.cpio.gz >> CHK include/generated/compile.h >> AS usr/initramfs_data.o >> LD usr/built-in.o >> ... >> >> When I run the kernel in qemu I get an error message which complains about >> /etc/init.d/rcS missing. > > > Did you check initramfs for rc.S script? > > The kernel configuration, busybox configuration and the layout of initramfs > (which should be /home/sasha/linux/usr/initramfs_list) should be consistent. > If the kernel is asking for it then it is not consistent. > >> >> The posts online seem to suggest that this has got to do with the busybox >> configuration. >> So far, I have not been able to get my head around this problem. >> Any points or suggestions would be much appreciated. >> >> Alexander Kapshuk. >> >> >> _______________________________________________ >> Kernelnewbies mailing list >> Kernelnewbies@xxxxxxxxxxxxxxxxx >> https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >> > > > Thank you. > Shahbaz Khan Apologies for the delay in replying. Thanks very much for all of your responses. I'll give them all a try. _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies