On Tue, 03 Apr 2012 08:23:42 +0200
[email protected] wrote:
> In my a Linux based device there are CPU( yes, it is MIPS) and BIOS and
> SDRAM modules.
> If I have BIOS chip in that device, I can easily write to SDRAM and I read
> the same value I wrote.
> But if I remove BIOS I can not read the same values that should have been
> written.
> ( Yes, MIPS CPU is in debug mode as well)
>
> I thought that JTAG depends on working CPU only but NOT on BIOS.
> Is that so ?
> Or BIOS can prevent/mask the values coming to/from SDRAM?
> Thanks
Have you initialized the SDRAM controller? The BIOS (or boot loader, etc)
initializes lots of CPU internal hardware. In the least you have to ensure
that you initialize the memory controllers and the I/O pins correctly.
Attila Kinali
--
The trouble with you, Shev, is you don't say anything until you've saved
up a whole truckload of damned heavy brick arguments and then you dump
them all out and never look at the bleeding body mangled beneath the heap
-- Tirin, The Dispossessed, U. Le Guin
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