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mips mmu setup
- To: ecos-discuss at sourceware dot cygnus dot com
- Subject: [ECOS] mips mmu setup
- From: Chris Morrow <cmorrow at YottaYotta dot com>
- Date: Sun, 25 Feb 2001 19:14:47 -0700
- Organization: YottaYotta Inc.
- References: <ELEIIPIOKOBPDLLMNHKJAEBLCBAA.ppham@mit.edu> <3A6369EB.E071860B@YottaYotta.com> <3A63B257.4E238048@redhat.com> <3A99B9B6.444A2F22@YottaYotta.com>
For the vrc4373 port, the hal_mips_setup routine
use add instructions for the following sequence.
li tmp,PADDR_INC
add vaddr,vaddr,tmp
add paddr0,paddr0,tmp
Which is okay until you try to map in 2 gig of
address space at which point the vaddr calculate
will result in 0x80000000 during the last interation
of the loop. This will cause an interger overflow
exception.
All the add's in that function should probably be addu's.
--
Chris Morrow YottaYotta Inc.
email: cmorrow@yottayotta.com
phone: (780) 439 9000 ext 227
web: http://www.yottayotta.com