Re: get_pgd_slow() function

I'm using an 860 processor running at 80MHz.
The problem that I have is that the shell don't start.

During the debugging phase made on the 2.2.13
the code executed the function exec_mmap(). Inside on it was
executed the macro SET_PAGE_DIR and after this execution the code
was crashed.
Investigating on that I discovered that code was crash immediately when
the
MTWB register was changed.
.....
That because MMU interrupt routine was accessing to some bad memory area.

Investigating on reasons for that I have made the Hypothesis that MMU
table was not well initialized, from this I made some changes on the
get_pgd_slow function.

Some day ago during the porting on linux-2.4.1 the same problem happens
so now it is time to resolve and understand why it happen

I like your hypothesis on cache, I have the cache configured with
COPYBACK
disabled so:

# CONFIG_8xx_COPYBACK is not set

and I'll try to change it....

But many doubt remaining....

Ciao,
/Giacomo

Dan Malek wrote:

Borlizzi Giacomo wrote:

quoted

but I've modified with:

What made you think you need to do this?
Something isn't right.  The 'memcpy' you added just copies zero values
from the init pgd into the new pgd, which the 'memset' already did
for you.  Either the 'memset' you are using isn't correct, or the
act of copying that much data flushed cache lines.  What kind of
processor do you have?

        -- Dan

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