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FS#515 - (x86_64) No support for generic EFI framebuffer #5470

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openwrt-bot opened this issue Feb 14, 2017 · 5 comments
Closed

FS#515 - (x86_64) No support for generic EFI framebuffer #5470

openwrt-bot opened this issue Feb 14, 2017 · 5 comments
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@openwrt-bot
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alive4ever:

There is no display on the vga console when booting LEDE x86/64 generic on UEFI - chainloaded via grubx64-standalone.efi - on Qemu with EDK II OVMF.

To reproduce this, manual steps are needed, since LEDE image for x86_64 doesn't support native UEFI boot.

  1. Create a disk image:
    $ qemu-img create -f raw lede-test.img 512M
  2. Setup the disk image as loop device.
    # losetup -f lede-test.img
  3. Create 2 partitions, a 100MB vfat partition to hold efi files and an ext3 partition to hold root filesystem. MBR is assumed. parted/gparted can be used in place of fdisk.
    # fdisk /dev/loop0
    # mkfs.vfat /dev/loop0p1
    # mkfs.ext3 /dev/loop0p2
  4. Mount vfat partition somewhere, for example on /mnt/boot
    # mkdir /mnt/boot && mount /dev/loop0p1 /mnt/boot
  5. Create EFI directory inside /mnt/boot
    # mkdir -p /mnt/boot/EFI/BOOT
  6. Mount ext3 partition somewhere, such as /mnt/rootfs
    # mkdir /mnt/rootfs && mount /dev/loop0p2 /mnt/rootfs
  7. Generate a standalone grub efi image.
    grub2-mkstandalone --modules="part_msdos part_gpt" --format=x86_64-efi --output=/mnt/boot/EFI/BOOT/BOOTX64.EFI
  8. Put LEDE kernel on the boot partition.
    /mnt/boot/lede-x86-64-vmlinuz
  9. Extract LEDE rootfs on the rootfs partition.
    # tar -C /mnt/rootfs -xf lede-x86-64-generic-rootfs.tar.gz
  10. Unmount the directories.
    # umount -v /mnt/rootfs /mnt/boot
  11. Detach the disk image from loop device.
    # losetup -d /dev/loop0
  12. Launch QEMU with UEFI firmware (OVMF_CODE.fd can be extracted from rpm file on https://www.kraxel.org/repos/jenkins/edk2/)
    $ qemu-system-x86_64 -enable-kvm -m 512M -drive file=lede-test.img,format=raw -bios /usr/share/edk2/ovmf/OVMF_CODE.fd -serial stdio
  13. On the grub prompt, type the following
insmod efi_gop insmod efi_uga insmod video_bochs insmod video_cirrus insmod gfxterm terminal_input console terminal_output console gfxterm set gfxpayload=keep

linux (hd0,msdos1)/lede-x86_64-vmlinuz root=/dev/sda2 rootfstype=ext3 rootwait noinitrd console=tty0 console=ttyS0,115200n8

boot

LEDE will boot, but no output shown on the VGA display. The only output is shown on the serial console.

Enabling CONFIG_FB_EFI for x86/64 target is needed to display graphical output on the EFI framebuffer.
@openwrt-bot
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alive4ever:

LEDE kernel is EFI-stub enabled. So, instead of creating a grub standalone efi image to chainload the kernel, it is possible to load the kernel directly from EFI shell as long as the UEFI and kernel architecture match (x86_64 UEFI to launch x86_64 kernel).
Shell> fs0
fs0:> .\boot\lede-x86_64-vmlinuz root=/dev/sda2 rootfstype=ext3 rootwait noinitrd console=tty0 console=ttyS0,115200n8

@openwrt-bot
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alive4ever:

I can get LEDE to display text on the EFI framebuffer console by enabling CONFIG_FB_EFI and CONFIG_FB_SIMPLE.

diff --git a/target/linux/x86/64/config-default b/target/linux/x86/64/config-default
index 0f23a9df75..b5a2b0a482 100644
--- a/target/linux/x86/64/config-default
+++ b/target/linux/x86/64/config-default
@@ -115,9 +115,10 @@ CONFIG_FB_CFB_COPYAREA=y
CONFIG_FB_CFB_FILLRECT=y
CONFIG_FB_CFB_IMAGEBLIT=y
CONFIG_FB_CMDLINE=y
-# CONFIG_FB_EFI is not set
+CONFIG_FB_EFI=y
CONFIG_FB_HYPERV=y
CONFIG_FB_MODE_HELPERS=y
+CONFIG_FB_SIMPLE=y
CONFIG_FB_TILEBLITTING=y

CONFIG_FB_VESA is not set

CONFIG_FONTS is not set

There is no increase in the kernel binary with this change.

@openwrt-bot
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alive4ever:

Pull request has been submitted: lede-project/source#851

@openwrt-bot
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alive4ever:

Resubmitted: lede-project/source#860

@openwrt-bot
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nbd:

Fixed in r3551-2712497442

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