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From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: linuxppc-dev@lists.ozlabs.org, Alexey Kardashevskiy <aik@ozlabs.ru>
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Subject: Re: [RFC PATCH kernel] powerpc: Fix early setup to make early_ioremap
 work
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Date: Fri, 21 May 2021 22:44:13 +1000
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On Thu, 20 May 2021 13:29:19 +1000, Alexey Kardashevskiy wrote:
> The immediate problem is that after
> 0bd3f9e953bd ("powerpc/legacy_serial: Use early_ioremap()")
> the kernel silently reboots. The reason is that early_ioremap() returns
> broken addresses as it uses slot_virt[] array which initialized with
> offsets from FIXADDR_TOP == IOREMAP_END+FIXADDR_SIZE ==
> KERN_IO_END- FIXADDR_SIZ + FIXADDR_SIZE == __kernel_io_end which is 0
> when early_ioremap_setup() is called. __kernel_io_end is initialized
> little bit later in early_init_mmu().
> 
> [...]

Applied to powerpc/fixes.

[1/1] powerpc: Fix early setup to make early_ioremap work
      https://git.kernel.org/powerpc/c/e2f5efd0f0e229bd110eab513e7c0331d61a4649

cheers