Re: MMU and BDI2000

Re: MMU and BDI2000

[Wolfgang Denk]

In message <5.1.0.14.0.20010915223300.02bef9f0@pop.gmx.de> you wrote:
>
> >default  translation  is  enabled.  See  the  BDI2000  user's manual,
> >Section "3.2.2 Part [TARGET]" (Entries "MMU XLAT  [kb]"  and  "PTBASE
> >addr") and Section "3.3.4 Embedded Linux MMU Support".
>
> You have no idea how often I had read this and I couldn't even find out if
> it belongs to my problem.
>
> How do I get the swapper_pg_dir? Is it the constant address from System.map?

You need the contents, like that:

(gdb) target remote bdi:2001
Remote debugging using bdi:2001
0x100 in ?? ()
(gdb) b start_here
Breakpoint 1 at 0xc0002180
(gdb) c
Continuing.

Breakpoint 1, 0xc0002180 in start_here ()
(gdb) p &swapper_pg_dir
$1 = (<data variable, no debug info> *) 0xc0130000


Now at the BDI2000 telnet prompt:

BDI>mm 0xf0 0xc0130000


And the again with GDB;

(gdb) c
Continuing.


Wolfgang Denk

--
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd@denx.de
I've got to get something inside me. Some coffee  or  something.  And
then the world will somehow be better.
                                     - Terry Pratchett, _Men at Arms_

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Re[2]: MMU and BDI2000

[Ricardo Scop]

Michael,

Saturday, September 15, 2001, 11:46:10 AM, you wrote:

MH> [REGS]
MH> DMM1    0x0FF00000

Maybe it's just a typo, but the above line should be, in your case:

DMM1   0xFF000000

[]'s, Scop                            mailto:scop@digitel.com.br


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Re: MMU and BDI2000

[Dan Malek]

Michael Habermann wrote:

> How do I get the swapper_pg_dir? Is it the constant address from System.map?

Ooops...You shouldn't have seen any version of the software that makes
any
reference to swapper_pg_dir.....

The configuration file you attached looks fine for the recent 2.4
kernels.
If you want to backtrace into the currently running application (useful
for system call parameters), ensure you enable the 'CONFIG_BDI_SWITCH'
option.  I left it disabled by default because it adds three
instructions
to the context switch overhead.


	-- Dan

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