Re: HIGHMEM Query

[Ralf Baechle <ralf@linux-mips.org>]

On Thu, Feb 17, 2005 at 10:40:22AM +0530, Rishabh@soc-soft.com wrote:

First, fix your mailer setup, it's littering emails with extra carriage
returns.

> I have been working on HIGHMEM fixation for 2.4.20 linux MVL kernel for
> MIPS architecture.
> I am getting DATA BUS ERROR(ADDR: 0xffffd000) exception when loading
> (copying the data received from ethernet to the kernel space in FIXADDR
> SPACE) "/sbin/init" from TARGET ROOT DIR (through NFS). I figured out
> that this is because there is no corresponding page table entry for the
> same.

That does not make sense.  If you don't have a pagetable entry the CPU will
take a TLB reload exception.  If the entry is invalid, the kernel will
die with an oops.  A bus error has different causes.

  Ralf