Beagleboard rev c2 has 256MB of NAND flash. Normal sequence is to load MLO and u-boot from flash. If you hold the user button when powering up it then loads MLO and u-boot from SD.
------ Original message ------
From: Gerald Coley
Date: 11/23/2014 12:21 PM
To: [email protected];
Subject:Re: [beagleboard] Is my Beagleboard dram dead?
On the the BeagleBoard we booted form SD. Not NAND. So I am not sure where the support for booting from Flash comes from. We only implemented Flash (eMMC) on the BeagleBone Black.
Gerald
On Sun, Nov 23, 2014 at 9:55 AM, 'David Batzle' via BeagleBoard <[email protected]> wrote:
Which is why I was thinking maybe a bad flash to NAND had caused a problem. The DRAM is definitely not working now.
When x-loader goes to load u-boot.bin off of MMC, it passes a file name to a function in fat.c. The function copies the filename into DRAM and then parses the copy of the name. It never finds a name because the contents of DRAM are zeros. If I modify the function so that the copy of the filename and the contents read from the MMC card are both in SRAM, then I get a message of loading u-boot.bin from MMC but then it locks up.
My next step I am planning to modify x-loader so it can properly wipe the NAND clean. I just didn't want to waste my time if a bad flash would not be a possible cause.
Thanks.
--------------------------------------------
On Sun, 11/23/14, Gerald Coley <[email protected]> wrote:
Subject: Re: [beagleboard] Is my Beagleboard dram dead?
To: "[email protected]" <[email protected]>
Date: Sunday, November 23, 2014, 10:31 AM
If it booted the
Always image, then the DRAM is working. Code executes out of
DRAM.
Gerald
On Sun, Nov 23, 2014
at 9:04 AM, 'davidcb' via BeagleBoard <[email protected]>
wrote:
I have a Beagleboard Rev. C2. I fired it up after
not using it for a couple of years. It booted the Always
Innovating image I had installed. I decided to try to put
Debian on it. I used the flasher script to try to update
u-boot (thank you RobertCNelson). U-boot would lock up just
after printing out DRAM on the serial console.
I tried a bunch of different things and managed
to get the flasher MLO flashed to the NAND but nothing else
got flashed.
I had been have better luck with x-loader so I
downloaded x-loader source version 1.5.1. It correctly
identifies the revision of the board but will not load
u-boot. Hacking up x-loader source I have been able to
figure out that anything that gets loaded to the DRAM gets
read back as all zeros.
My question is, is there anything that could
happen in a bad write to NAND that would interfere with
DRAM? I had already hard coded the memory configuration in
x-loader so it was not relying on the configuration values
in NAND. I am thinking the DRAM is probably
bad.
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the
Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails
from it, send an email to [email protected].
For more options, visit https://groups.google.com/d/optout.
--
Gerald
[email protected]
http://beagleboard.org/
http://circuitco.com/support/
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the
Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails
from it, send an email to [email protected].
For more options, visit https://groups.google.com/d/optout.
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
For more options, visit https://groups.google.com/d/optout.
--
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
For more options, visit https://groups.google.com/d/optout.
For more options, visit http://beagleboard.org/discuss
---
You received this message because you are subscribed to the Google Groups "BeagleBoard" group.
To unsubscribe from this group and stop receiving emails from it, send an email to [email protected].
For more options, visit https://groups.google.com/d/optout.
