Hi, folks I have a 405GPr based board with 512M of RAM. My kernel is 2.4.17 from Monta Vista Linux 2.1. I'm trying to reserve 64M on boot using mem=448M and map it later by
ioremap(__pa(high_memory), 64*(1<<20)); This worked fine when system had 256M of RAM, but now ioremap fails. If I understand the kernel code correctly, by adding more RAM I've reduced the vmalloc/ioremap space. I can also see that this space is reduced dramatically on boot by mappings done in arch/ppc/kernel/ppc4xx_setup.c:m4xx_map_io() Is there any way to fix problem ? Is it necessary to have a 1:1 virtual to physical mappings as its done in m4xx_map_io() or maybe higher virtual addresses can be used, thus allowing to save some precious ioremap space. Thanks a lot in advance. Please CC me, as I'm not on the list. Felix.
