[U-Boot-Users] Running test code from RAM while having GOT po inting to flash
atul.sabharwal at exgate.tek.com
atul.sabharwal at exgate.tek.com
Tue Oct 25 19:46:37 CEST 2005
I am using DDR2 memory abstracted from me by a FPGA based memory controller.
Hopefully, the hardware engineer is configuring it correctly. All register
accesses are GPCM based. I build a version of u-boot with I-Cache turned
off and it still failed. The Burst inhibit flag is turned on. I am able
To do block copies with the assembly routines (memcpy, strcpy) which are
faster than a C based for loop.
I am thinking of using the JTAG and copy some PPC code into RAM in a
Infinite loop and run it manually.
Basically, some test to run some code from flash without relocation.
--
Atul
-----Original Message-----
From: wd at denx.de [mailto:wd at denx.de]
Sent: Monday, October 24, 2005 11:51 PM
To: Sabharwal, Atul
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] Running test code from RAM while having GOT
pointing to flash
In message
<4A062D477D842B4C8FC48EA5AF2D41F20152806A at us-bv-m23.global.tektronix.net>
you wrote:
> My code seems to be crashing in the relocate_code routine while switching
> from flash to RAM. There was an address_probe fixup which was not enabled
> And I enabled it. So, the relocation table (GOT) gets copied successfully
> From flash to RAM but the code dies seomewhere between coping the fixups
I think you misunderstand the function of the GOT.
> And the in_ram label. Somehow, on my BDI, it sees an exception and goes
> to the reset vector i.e 0x100.
See the FAQ at http://www.denx.de/wiki/view/DULG/UBootCrashAfterRelocation
> My approach is to avoid the GOT stuff and write a test routine which is
The "GOT stuff" is known to work just fine. I suggest you focus on
the remaining stuff, i. e. your SDRAM init sequence. Again, see the
FAQ.
Best regards,
Wolfgang Denk
--
Software Engineering: Embedded and Realtime Systems, Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
I often quote myself; it adds spice to my conversation. - G. B. Shaw
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