Bug 13586

Summary: grub failure with BR2_OPTIMIZE_3
Product: buildroot Reporter: Peter Seiderer <ps.report>
Component: OtherAssignee: unassigned
Status: RESOLVED FIXED    
Severity: normal CC: buildroot
Priority: P5    
Version: 2021.02   
Target Milestone: ---   
Hardware: All   
OS: Linux   
Host: Target:
Build:

Description Peter Seiderer 2021-03-07 21:46:35 UTC 
Following defconfig works (real hardware and qemu):

BR2_x86_64=y
BR2_KERNEL_HEADERS_5_10=y
BR2_TOOLCHAIN_BUILDROOT_WCHAR=y
BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
BR2_TARGET_GENERIC_GETTY_PORT="tty1"
BR2_ROOTFS_POST_BUILD_SCRIPT="board/pc/post-build.sh"
BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/pc/genimage-bios.cfg"
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_CUSTOM_VERSION=y
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.20"
BR2_LINUX_KERNEL_DEFCONFIG="x86_64"
BR2_LINUX_KERNEL_INSTALL_TARGET=y
BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
BR2_TARGET_ROOTFS_EXT2=y
BR2_TARGET_ROOTFS_EXT2_4=y
BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
# BR2_TARGET_ROOTFS_TAR is not set
BR2_TARGET_GRUB2=y
BR2_PACKAGE_HOST_GENIMAGE=y

Started with:

$ qemu-system-x86_64 -m 4096 --drive format=raw,file=images/disk.img

Shows BIOS, Grub and Startup until buildroot login...


Changing from BR2_OPTIMIZE_S to BR2_OPTIMIZE_3:

BR2_x86_64=y
BR2_OPTIMIZE_3=y
BR2_KERNEL_HEADERS_5_10=y
BR2_TOOLCHAIN_BUILDROOT_WCHAR=y
BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
BR2_TARGET_GENERIC_GETTY_PORT="tty1"
BR2_ROOTFS_POST_BUILD_SCRIPT="board/pc/post-build.sh"
BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/pc/genimage-bios.cfg"
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_CUSTOM_VERSION=y
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.10.20"
BR2_LINUX_KERNEL_DEFCONFIG="x86_64"
BR2_LINUX_KERNEL_INSTALL_TARGET=y
BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
BR2_TARGET_ROOTFS_EXT2=y
BR2_TARGET_ROOTFS_EXT2_4=y
BR2_TARGET_ROOTFS_EXT2_SIZE="120M"
# BR2_TARGET_ROOTFS_TAR is not set
BR2_TARGET_GRUB2=y
BR2_PACKAGE_HOST_GENIMAGE=y

Resulting image fails to start on real hardware, started with

$ emu-system-x86_64 -m 4096 --drive format=raw,file=images/disk.img

shows BIOS message 'Booting from Hard Disk...', 'GRUB loading...' and
loops endless re-booting...
Comment 1 Peter Seiderer 2021-06-02 20:33:32 UTC 
There is some follow up discussion on the mailing list, see [1], resulting in suggested patch to force '-Os' for grub compile, see [2]...

[1] http://lists.busybox.net/pipermail/buildroot/2021-May/311524.html
[2] http://lists.busybox.net/pipermail/buildroot/2021-May/311630.html
Comment 2 Peter Korsgaard 2021-08-10 07:23:04 UTC 
This has now been worked around in git:
https://git.buildroot.org/buildroot/commit/?id=7cb51d4843caaa9144270d92f86e60d8b5a2a1ec
Comment 3 Peter Korsgaard 2021-08-10 07:24:33 UTC 
This has now been worked around in git:
https://git.buildroot.org/buildroot/commit/?id=7cb51d4843caaa9144270d92f86e60d8b5a2a1ec