linux-kernel - Re: [PATCH fixes 1/3] MIPS: Loongson64: Reserve vgabios memory on boot

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Message-ID: <ad90b43e-896a-fd51-4aac-8ded927fb0e5@omp.ru>
Date:   Wed, 1 Nov 2023 19:21:57 +0300
From:   Sergey Shtylyov <s.shtylyov@....ru>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
CC:     Huacai Chen <chenhuacai@...nel.org>, <linux-mips@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH fixes 1/3] MIPS: Loongson64: Reserve vgabios memory on
 boot

On 11/1/23 2:39 PM, Jiaxun Yang wrote:

> vgabios is passed from firmware to kernel on Loongson64 systems.
> Sane firmware will keep this pointer in reserved memory space
> passed from the firmware but insane firmware keeps it in low
> memory before kernel entry that is not reserved.
> 
> Previously kernel won't try to allocate memory from low memory
> before kernel entry on boot, but after converting to memblock
> it will do that.
> 
> Fix by resversing those memory on early boot.

   Reserving? :-)

> Cc: stable@...r.kernel.org
> Fixes: a94e4f24ec83 ("MIPS: init: Drop boot_mem_map")
> Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
[...]

MBR, Sergey