Public bug reported:
Environment:
Hardware: Raspberry Pi 5 Model B Rev 1.0 (8GB RAM)
Ubuntu Release: Ubuntu 26.04 LTS
Kernel: 7.0.0-1017-raspi (arm64)
Summary:
On Raspberry Pi 5 hardware, the Raspberry Pi bootloader/EEPROM firmware
dynamically prepends hardware-tuning parameters to /proc/cmdline at boot
time, including numa=fake=8 and numa_policy=interleave.
While Raspberry Pi OS's vendor kernel carries a downstream patch adding
fake NUMA support to ARM64 for the BCM2712, Ubuntu's linux-raspi kernel
does not recognise numa=fake=8 on ARM64. Consequently, every boot on a
Raspberry Pi 5 emits an early boot error:
[ 0.000000] Malformed early option 'numa'
Steps to reproduce:
flash standard ubu26.04 on raspberry pi5, boot the board and run dmesg
Observed results:
[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x414fd0b1]
[ 0.000000] Linux version 7.0.0-1017-raspi (buildd@bos03-arm64-107) ...
[ 0.000000] Machine model: Raspberry Pi 5 Model B Rev 1.0
[ 0.000000] Malformed early option 'numa'
Catting /proc/cmdline
reboot=w coherent_pool=1M 8250.nr_uarts=1 pci=pcie_bus_safe
numa_policy=interleave nvme.max_host_mem_size_mb=0 numa=fake=8
system_heap.max_order=0 iommu_dma_numa_policy=interleave
smsc95xx.macaddr=...
Expected behavior:
(Preferred): The Ubuntu linux-raspi kernel cherry-picks the Raspberry Pi
Foundation's fake NUMA patch for BCM2712 so memory interleaving works as
intended on Pi 5.
(Alternative): The numa=fake=X option is handled/ignored cleanly without
logging an error on official certified hardware.
** Affects: linux-raspi (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2166421
Title:
Malformed early option 'numa' passed in numa=fake=8
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