| ARC700 4.10 supports configurable MMU page sizes: |
| ARC Linux supports: 8k (default), 4k and 16k |
| |
| Following are the steps to add non-default page size support to kernel/tools. |
| |
| -------------------------------------------------------------------------- |
| (1) kernel |
| -------------------------------------------------------------------------- |
| Edit arch/arc/include/asm/page.h |
| |
| -#define PAGE_SHIFT 13 //8k |
| +#define PAGE_SHIFT 14 //16k |
| +#define PAGE_SHIFT 12 //4k |
| |
| -------------------------------------------------------------------------- |
| (2) Tools |
| -------------------------------------------------------------------------- |
| The system libs (uClibc/math/pthread etc) as well as the exported headers |
| need to be rebuilt with modified page size. |
| |
| (2a) Since all the tools need not be rebuilt, clone an existing 2.4 based |
| installed GNU tool-chain |
| |
| cp-rfd GNUINST GNUINST_stock8k |
| |
| (2b) As of Sept 1st 2011- You'll need to hack the installed linker scripts |
| for both shared libs as well as executables. |
| The same scripts are good for 4k/8k/16k. |
| |
| GNUINST/uclibc/arc-linux-uclibc/lib/ldscripts/arclinux.x |
| GNUINST/uclibc/arc-linux-uclibc/lib/ldscripts/arclinux.xs |
| |
| - . = ALIGN(0x2000) + (. & (0x2000 - 1)); |
| + . = DATA_SEGMENT_ALIGN (0x4000, 0x2000); |
| |
| (2c) Edit GNUSRC/2.4/uClibc-0.9.29/libc/sysdeps/linux/arc/bits/uClibc_page.h |
| |
| -#define PAGE_SHIFT 13 //8k |
| +#define PAGE_SHIFT 14 //16k |
| +#define PAGE_SHIFT 12 //4k |
| |
| (2d) Rebuild uClibc (which rebuilds other system libs as well) |
| cd GNUSRC/2.4/uClibc-0.9.29 |
| make CROSS_COMPILE=arc-linux-uclibc-gcc && make install |
| |
| This will install the specific 4k or 16k variant of libs/headers in GNUINST |
| |
| (2e) Modify you path to point to the 8k based toolcian (GNUINST_stock8k) or |
| the modified page size based one (GNUINST) |
