From: Kevin Hickey <khickey@netlogicmicro.com>
To: figo zhang <figo1802@gmail.com>
Cc: ralf@linux-mips.org, linux-mips@linux-mips.org
Subject: Re: how to support more than 512MB RAM for MIPS32 ?
Date: Wed, 25 Nov 2009 08:37:37 -0600 [thread overview]
Message-ID: <1259159857.4675.11.camel@kh-d280-64> (raw)
In-Reply-To: <c6ed1ac50911242234p12817b55r1a062d59949308bf@mail.gmail.com>
We use HIGHMEM on the Au1300 to access any memory spaces >256 MB. Our
I/O area starts at 256 MB. We just map the extra DRAM to any area
outside the I/O space, enable highmem, and register it as BOOT_MEM_RAM
with add_memory_region. Works great.
=Kevin
--
Kevin Hickey
Netlogic Microsystems
On Wed, 2009-11-25 at 14:34 +0800, figo zhang wrote:
> hi all,
>
> I am using 24KEC SOC, i want to support larger more than 512MB RAM.
> The mips32 architure in Kseg0/Kseg1,
> such as:
> 0x8000,0000 ~ 0x92c0,0000 # 300MB for RAM
> 0x92c0,0000 ~ 0xa000,0000 # 212 for I/O register
>
> so, mips32 only support 300MB memory, i dont how to support more than
> 512MB in linux-mips kernel , such as 2GB memory? it is using HIGHMEM
> strategy
> for kernel(ZONE_HIGHMEM)?
>
> Best,
> Figo.zhang
next prev parent reply other threads:[~2009-11-25 14:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-25 6:34 how to support more than 512MB RAM for MIPS32 ? figo zhang
2009-11-25 14:37 ` Kevin Hickey [this message]
2009-11-25 15:31 ` Figo.zhang
2009-11-25 16:00 ` Ralf Baechle
2009-11-25 16:17 ` Figo.zhang
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