Using grub-image ?

[pgwipeout]

I got grub to work as an EFI payload from uboot, only caveat is that the display doesn't work. Install grub with --target=arm64-efi and --removable flags, and use the following boot script (adjust as needed to your setup):

Code:

setenv bootargs initrd=/boot/initramfs-linux.img console=ttyS0 console=tty1 root=LABEL=ROOT_MNJRO rw rootwait video=eDP-1:1920x1080@60 video=HDMI-A-1:1920x1080@60 bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash
load mmc 1:1 ${fdt_addr_r} dtbs/rockchip/rk3399-pinebook-pro.dtb
load mmc 1:1 ${kernel_addr_r} efi/EFI/BOOT/BOOTAA64.EFI
bootefi ${kernel_addr_r} ${fdt_addr_r}

And grub.cfg (adjust to your setup)

Code:

set timeout_style="menu"
set timeout=5
menuentry "Kernel" {
linux (hd0,msdos1)/Image console=tty1 root=LABEL=ROOT_MNJRO rw rootwait video=eDP-1:1920x1080@60 video=HDMI-A-1:1920x1080@60 bootsplash.bootfile=bootsplash-themes/manjaro/bootsplash
devicetree (hd0,msdos1)/dtbs/rockchip/rk3399-pinebook-pro.dtb
initrd (hd0,msdos1)/initramfs-linux.img
}

I've been poking around the u-boot source code to try and get the eDP and LCD drivers working <https://github.com/amiraeva/uboot-pbp>. So far I can get the display to flicker for a brief second before the u-boot serial console loads, and have run out of things to try. Any ideas/suggestions would be appreciated!

Did you get the grub serial console to work?
I only seem to get this output when booting grub from u-boot:

Code:

139264 bytes read in 12 ms (11.1 MiB/s)
error: no suitable video mode found.
EFI stub: Booting Linux Kernel...
EFI stub: EFI_RNG_PROTOCOL unavailable, no randomness supplied
EFI stub: ERROR: Could not determine UEFI Secure Boot status.
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]

But no menu.

Edit:
Figured it out, if anyone ever feels like they are nuking something, remember to change this:

Code:

GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=0

to

Code:

GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=2