increase lowmem value for ppc

Marco Stornelli marco.stornelli at
Thu Jul 17 21:14:03 EST 2008

Ruksen INANIR ha scritto:
> Is there a way to increase the lowmem value for ppc. The MAX_LOW_MEM is 
> defined as max 768 MB. But a value around 1.5 G works with no problem. 
> But when i try to increase this value to 1520 or more, kernel complaints 
> about no space for memory allocation when loading kernel modules.
> I do not want to use HIGHMEM config. What is the max lowmem value for a 
> ppc system? What other setting are needed to use 1520 MB (or more) as 
> lowmem .
> The ppc card has 2G on board memory. 2.4.22 kernel is used.
> Thanks
> _______________________________________________
> Linuxppc-embedded mailing list
> Linuxppc-embedded at
With 32-bit arch you may not use more than 1GB to map the memory (minus 
some space for some kernel operation). The value of 768MB was not there 
by chance.

Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni

marco.stornelli at
+39 06 72582838

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