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[ts-7000] Re: running root filesystem from ramdisk

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Subject: [ts-7000] Re: running root filesystem from ramdisk
From: "Hamish Avery" <>
Date: Thu, 22 Feb 2007 16:31:29 -0000
> > "Specified address (0xe0000000) is not believed to be in RAM -
> > continue (y/n)?"
> > 
> > I don't know why this might be...
>  
> This is a RedBoot message:  RedBoot runs with the MMU on, and only
> maps 32M I believe, even though TS-BOOTROM finds and sets up 64M.
> (Do you see a banner from redboot telling you 0x02000000 is
> available?). I ran into this when looking into using a 2.6 kernel
> with 64M ram.

That would explain the sequence that followed - after I pressed 'y' -
 in which the kernel complained about yet another range...


> > I am now guessing that its impossible to boot into a ramdisk
> > greater than 8Mb.
> 
> Sorry, I haven't tried any ramdisks.  But, I believe you are right
> in thinking the ramdisk must be in banks [0-3], ie, ram that 
> RedBoot knows about.  If it is really important to you, I guess you
> could hack redboot to map 64M and let you put a ramdisk in an upper
> bank, but I don't think that would change the 8M limit.

Whoa! I think thats beyond my skills - I don't think there would be
much to gain unless I could somehow map the ram so the kernel sees it
as continuous, and i could get my 32Mb ramdisk...

Thanks for the info

/hamish



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