Re: [PATCH] arm64: dts: qcom: x1e: bus is 40-bits (fix 64GB models)

[Jonathan Marek]

I was curious about this so I tried booting EL1
- 32GB CRD boots fine
- 64GB T14S boots with CONFIG_ARM64_VA_BITS_39 (except display driver 
didn't probe, because it depends on adsp firmware, lol). without 
CONFIG_ARM64_VA_BITS_39 it resets

Anyway making things worse for "64GB+EL1+broken firmware" shouldn't 
block this patch, because "64GB+EL1+broken firmware" needs workarounds 
anyway and this change is needed to use 64GB without issues otherwise.

On 11/30/25 7:13 PM, Steev Klimaszewski wrote:
> Hi All,
>
> On my Thinkpad T14S OLED with 64GB, with this patch applied, I am unable to boot
> the laptop anymore.  It doesn't matter whether I have mem=30GB, nor if I set
> CONFIG_ARM64_VA_BITS_39, or not limiting the ram - shortly after loading the
> device tree, the laptop just resets.
>
> I have tried over 20 boots with it applied, as well as trying both booting a
> working kernel, and then rebooting as well as cold boots.
>
>
> -- steev
.