suffisant space for U-Boot, Linux and an initrd image ? (4MB SDRAM)

suffisant space for U-Boot, Linux and an initrd image ? (4MB SDRAM)

[Fabien Oriede]

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Hi all,
I would like to know if this is possible to port U-Boot, Linux and an initrd image on a board with 4MB of SDRAM ?
When Linux try to boot, there is this line on the terminal :
"Memory : 2036k available (1036k kernel code, 256k data, 80k init, 0k highmem)"
So I have 2036k memory available for my initrd image but I don't know if this is suffisant.
Thanks in advance.
Regards,
Fabien.


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Re: suffisant space for U-Boot, Linux and an initrd image ? (4MB SDRAM)

[Marco Stornelli]

Fabien Oriede ha scritto:
> Hi all,
> I would like to know if this is possible to port U-Boot, Linux and an initrd image on a board with 4MB of SDRAM ?
> When Linux try to boot, there is this line on the terminal :
> "Memory : 2036k available (1036k kernel code, 256k data, 80k init, 0k highmem)"
> So I have 2036k memory available for my initrd image but I don't know if this is suffisant.
> Thanks in advance.
> Regards,
> Fabien.
> 
> 
>       _____________________________________________________________________________ 
> Envoyez avec Yahoo! Mail. Une boite mail plus intelligente http://mail.yahoo.fr
> 
> 
> ------------------------------------------------------------------------
> 
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> Linuxppc-embedded mailing list
> Linuxppc-embedded@ozlabs.org
> https://ozlabs.org/mailman/listinfo/linuxppc-embedded

Only 4MB of sdram? As far as I know the smallest device with Linux is 
picotux with 8MB of ram and 2MB of flash.

-- 
Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
http://www.coritel.it

marco.stornelli@coritel.it
+39 06 72582838

Re: suffisant space for U-Boot, Linux and an initrd image ? (4MB SDRAM)

[Wolfgang Denk]

In message <789365.58211.qm@web27401.mail.ukl.yahoo.com> you wrote:
>
> I would like to know if this is possible to port U-Boot, Linux and an initrd image on a board with 4MB of SDRAM ?

In Theory it may be possible, but just for very tiny demo
applications. Probably not for a useful device.

> When Linux try to boot, there is this line on the terminal :
> "Memory : 2036k available (1036k kernel code, 256k data, 80k init, 0k highmem)"
> So I have 2036k memory available for my initrd image but I don't know if this is suffisant.

Note that a ramdisk is NOT an efficient way to use memory. See fro
example http://www.denx.de/wiki/view/DULG/RootFileSystemSelection
which shows that for example a cramfs image is not only faster to boot
but also needs less RAM.

Best regards,

Wolfgang Denk

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Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
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