linux-kernel - Re: [MIPS] MEM_SDREFCFG is not defined for Alchemy DB1550 (compile fail)

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Message-ID: <4770DE51.5000205@ru.mvista.com>
Date:	Tue, 25 Dec 2007 13:41:21 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Alon Bar-Lev <alon.barlev@...il.com>
Cc:	linux-mips@....linux-mips.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [MIPS] MEM_SDREFCFG is not defined for Alchemy DB1550 (compile
 fail)

Hello.

Alon Bar-Lev wrote:

> When I have:
> CONFIG_MIPS_DB1550
> CONFIG_SOC_AU1550
> CONFIG_SOC_AU1X00
> CONFIG_PM

> MEM_SDREFCFG is used at:
> arch/mips/au1000/common/power.c::pm_do_freq()

    PM code is generally broken and unmaintained, so no wonder. I don't 
remember if anyone has fixed CPU context restoration code (it uses a "skewed" 
stack frame).

> While the MEM_SDREFCFG constant is declare only for CONFIG_SOC_AU1000,
> CONFIG_SOC_AU1500, CONFIG_SOC_AU1100 at:
> include/asm-mips/mach-au1x00/au1000.h

> Maybe MEM_SDREFCFG should be defined for CONFIG_SOC_AU1X00?

    I've just looked into the Au1550 datasheet and indeed it doesn't have such 
register; its SDDRAM controller is not compatible with older SoCs.

> Or there should be #ifdef for its usage in power.c?

    Looks like you'll have to invent something... ;-)

> Best Regards,
> Alon Bar-Lev.

WBR, Sergei
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