Hello, all~~~ I am using a MCP8548 board with 2.6.14.5 kernel. And I would like to upgrade memory from 512MB to 2048MB. Finally, I realize this is not so easy as I think. I encounter several problems. :~~
First, I change mem=512M to mem=2048M. 1. vmalloc fail problem So, I change kernel config in "advanced setup" Change "Set maximum low memory" from 0x30000000 to 0x80000000. Change "Virtual address of kernel base" from 0xC0000000 to 0x60000000. Change "Set custom user task size" from 0x80000000 to 0x60000000 Someone said that he could change "Virtual address of kernel base" to 0xA0000000 without problem. Could I change it to 0x60000000? Any possible problem? 2. In MMU_init( ), init.c #ifdef CONFIG_FSL_BOOKE /* Freescale Book-E parts expect lowmem to be mapped by fixed TLB * entries, so we need to adjust lowmem to match the amount we can map * in the fixed entries */ adjust_total_lowmem(); #endif /* CONFIG_FSL_BOOKE */ In adjust_total_lowmem(), fsl_booke_mmu.c It always limits the low memory to 768MB. (no matter we set mem=768MB or mem=1024MB, or mem=2048MB) __max_low_memory = max_low_mem = __cam0 + __cam1 + __cam2; (each TLB could map up to 256MB) My question is could I use more than 3 TLBs here? Such as 8 TLBs to map 2G ram? Or could I use e500v2 new feature, that is 1 TLB could map up to 4G? Any reference code? Any comment is welcom. Thanks a lot. Jay Chen... _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded