Hi all,
I am working on a PPC Motorola card, which runs Linux 2.4.22. The
card has 2 GB onboard memory. But with use 1456 MB of the available
memory. To increase the memory capacity i need to increase the used
memory at least 64 MB. With CONFIG_HIGHMEM option all of the 2 GB memory
can be used but, but the fc driver on the card has no high memory
support, so this caused problems.
Then i saw that the memory is limited to 1456 by
#define MAX_LOW_MEM 0x5B000000 setting in pgtable.c. I
tried to increase it by 64 MB but i could only increase the value of
MAX_LOW_MEM by 47 MB (1503 MB) without CONFIG_HIGHMEM option.
1)Is there any other setting that i should set other than
MAX_LOW_MEM to increase the usable memory to 1520 ?
2)I knew that the addressable physical memory without high memory
option was 1 G. How was it possible to address 1503 MB without
CONFIG_HIGHMEM ? What is the max usable memory for 2.4.22 kernel?
Thanks,
Rinanir.
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