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

["charliem_1216" <>]

--- In  "Hamish Avery" <> wrote:

> pretty harmless...  This is what I got:
> 
>   MM: bank 0 start 0x00000000 end 0x00800000
>   MM: bank 1 start 0x01000000 end 0x01800000
>   MM: bank 2 start 0x04000000 end 0x04800000
>   MM: bank 3 start 0x05000000 end 0x05800000
>   MM: bank 4 start 0xe0000000 end 0xe0800000
>   MM: bank 5 start 0xe1000000 end 0xe1800000
>   MM: bank 6 start 0xe4000000 end 0xe4800000
>   MM: bank 7 start 0xe5000000 end 0xe5800000
> 
> Thus, the memory blocks are indeed not continuous, even within the two
> greater addressing blocks - and the memory management to tie these
> together does not seem to work at kernel boot time.  The obvious
> conclusion now is that the ramdisk must lie wholely within a bank, as
> when I shift the smaller ramdisk to lie within one of the above blocks
> it works OK.  However, trying to put it into banks 4, 5, 6 or 7 fails
> with:
> 
> "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.

> 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.

Regards, ....... Charlie

> 
> Many thanks for the help
> 
> /hamish
>



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