fbcon=map:99 causes hang at "Loading initial ramdisk" after u-boot/m1n1 update

[cried-nutty-won]

Summary

After updating u-boot, m1n1 and linux-asahi (6.19.12+1 → 6.19.14+2) on Void Linux Asahi
(MacBook Pro M1 Pro 14"), both old and new kernels hang at "Loading initial ramdisk ..."
with no further output.

Root cause

fbcon=map:99 in GRUB_CMDLINE_LINUX_DEFAULT causes a silent hang during initramfs
loading with the updated u-boot/m1n1 stack. Removing this parameter restores normal boot
on both kernels.

System

• Machine: MacBook Pro 14" M1 Pro
• OS: Void Linux Asahi (aarch64)
• Packages updated: linux-asahi, asahi-uboot, m1n1
• Kernel before: 6.19.12+1-asahi_2
• Kernel after: 6.19.14+2-asahi_1

Steps to reproduce

1. Add fbcon=map:99 to GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub
2. Run xbps-install -Su including u-boot/m1n1/kernel update
3. Reboot → hang at "Loading initial ramdisk ..."

Fix

Remove fbcon=map:99 from /etc/default/grub and regenerate grub config:

sudo grub-mkconfig -o /boot/grub/grub.cfg

Suggestion

A post-install script warning or automatic migration removing fbcon=map:99
would prevent this silent breakage for users who added it following previous
Asahi documentation/recommendations.