linux-kernel - Re: [PATCH V4 2/3] arm64: support initrd outside kernel linear map

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Date:	Thu, 8 Oct 2015 10:40:55 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	yalin wang <yalin.wang2010@...il.com>
Cc:	Christoffer Dall <christoffer.dall@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"x86@...nel.org" <x86@...nel.org>,
	Will Deacon <Will.Deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Mark Salter <msalter@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH V4 2/3] arm64: support initrd outside kernel linear map

On Thu, Oct 08, 2015 at 05:18:14PM +0800, yalin wang wrote:
> is it also possible to implement it on ARM platforms?
> ARM64 platform don’t have HIGH_MEM zone .
> but ARM platform have .
> i remember boot loader must put init rd  into low memory region,
> so if some boot loader put init rd into HIGH men zone
> we can also relocate it to low men region ?
> then boot loader don’t need care about this ,
> and since vmalloc= boot option will change HIGH mem region size,
> if we can relocate init rd , boot loader don’t need care about init rd load address,
> when change vmalloc= boot options .

I'd be more inclined to say yes if the kernel wasn't buggering around
passing virtual addresses (initrd_start) of the initrd image around,
but instead used a physical address.  initrd_start must be a lowmem
address.

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