From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Fri, 4 Sep 2015 10:54:09 +0200 Subject: [Buildroot] [bug] bootwrapper runs before linking initrd In-Reply-To: <55E8C311.6000404@mentor.com> References: <55E8C311.6000404@mentor.com> Message-ID: <20150904105409.53804439@free-electrons.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hollis, On Thu, 3 Sep 2015 15:00:49 -0700, Hollis Blanchard wrote: > I have a BR config that includes the following: > BR2_LINUX_KERNEL=y > BR2_TARGET_ROOTFS_INITRAMFS=y > BR2_TARGET_BOOT_WRAPPER_AARCH64=y Yes, this is not working right now. > I expect that Buildroot will: > > 1. build the kernel > 2. build rootfs.cpio > 3. link rootfs.cpio into the kernel as an initrd > 4. run boot-wrapper-aarch64 on the kernel+initrd > > When I do a build, however, I can clearly see that step 4 happens before > step 3. In fact, "Rebuilding kernel with initramfs" is the very last > step of the build. "boot-wrapper-aarch64 Installing to images directory" > happened much earlier. > > (Side note: the error is far more catastrophic than a simple "couldn't > find root filesystem" panic; it looks like big chunks of the kernel's > data section are zeroed, so that kernel messages aren't even logged, to > say nothing of no serial output. I don't know why this is.) > > A workaround is to remember to manually "make > boot-wrapper-aarch64-rebuild" after a regular build has completed. > > What's the real solution? Thanks! See http://lists.busybox.net/pipermail/buildroot/2014-July/101052.html for a possible solution. I remember we discussed this patch during the Buildroot Summer camp, but I thought we had sent some comments for Jeremy to improve the patch. But it seems it wasn't done. Arnout, do you remember the conclusion of our discussion? I must say I'm not thrilled by making such major changes to Buildroot just for the sake of this very specific use-case. But we probably don't have much choice. Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com