arm64 broken in -next by commit 08d53aa58cb1 (of/fdt: export fdt blob as /sys/firmware/fdt)

[Catalin Marinas]

On Wed, Dec 10, 2014 at 12:13:26PM +0000, Catalin Marinas wrote:
> On Wed, Dec 10, 2014 at 12:04:23PM +0000, Catalin Marinas wrote:
> > Ard,
> > 
> > I noticed that linux-next no longer boots on Juno. Bisecting, I ended up
> > on your commit above and reverting it gets things going again. I
> > initially thought it has something to do with the hardware crypto since
> > you added some crc32_be() calls but disabling arm64 hw crypto didn't
> > make any difference.
> 
> Commenting out crc32_be() in early_init_dt_verify() allows it to boot.
> Some printk, it shows:
> 
> initial_boot_params = 0xffffffc01fe00000
> fdt_totalsize(initial_boot_params) = 2108105
> 
> Isn't it quite big?

We assume that the DT blob is maximum 2MB in the initial kernel mapping.
I'm not sure why it is that big here but early_init_dt_verify() most
likely doesn't have the areas around initial_boot_params mapped, only
2MB section. The crc probably triggers a very early data abort.

-- 
Catalin