2008-01-16 05:07:44     Adding RAM to blackfin

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2008-01-16 05:07:44     Adding RAM to blackfin

Paolo Chiesa (ITALY)

Message: 49644    Hi,

    I need to design a new board with blackfin BF537 and I need to have 256 MB of RAM.

    I know that blackfin is able to address 512 MB of SDRAM. How can I manage all this new memory under the      uClinux?

    Have anyone already tried to design a new board with more than 64 MB of RAM?

 

   Thank ou for th help,

   PAOLO

 

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2008-01-16 05:48:23     Re: Adding RAM to blackfin

Andrea Federico (UNITED STATES)

Message: 49645    Hi Paolo:

In my custom board I use 128Mb, in uClinux  I did this changes:

 

make linux_menuconfig

Board customizations--->SDRAM Memory Size in MBytes=128

                                        --->SDRAM Memory Address Width=11

 

I don't remember if you must modify uboot.

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2008-01-16 05:52:00     Re: Adding RAM to blackfin

Andrea Federico (UNITED STATES)

Message: 49646    Paolo:

I forgot to say I use bf537 silicon rev 0.3,  if you use revision 0.2 you can't

use more than 64 Mb.

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2008-01-16 06:27:04     Re: Adding RAM to blackfin

Mike Frysinger (UNITED STATES)

Message: 49664    if your memory settings dont match the default, then you need to modify the board configuration file in u-boot for proper operation

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2008-01-16 06:50:57     Re: Adding RAM to blackfin

Michael Hennerich (GERMANY)

Message: 49665   

 

You will have a hard time finding suitable SDRAMS for a 256 or 512 MBytes configuration.

 

-Michael

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2008-01-18 04:34:50     Re: Adding RAM to blackfin

Paolo Chiesa (ITALY)

Message: 49772    Hi Andrea,

               with the 0.3 silicon revision do you have problems with 128 MB?  Is it necessary only to modify the kernel and u-boot configuration? Why with the 0.2 silicon revision it's impossible adding new RAM?

 

Thank you for help,

PAOLO

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2008-01-18 04:39:21     Re: Adding RAM to blackfin

Paolo Chiesa (ITALY)

Message: 49773    Hi Michael,

                 as RAM I have found MT48LC32M16A2 micron (512 Mbit). What do you think?

 

Thank you for help ,

PAOLO

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2008-01-18 05:39:12     Re: Adding RAM to blackfin

Mike Frysinger (UNITED STATES)

Message: 49777    please review the question about 128meg in the FAQ:

http://docs.blackfin.uclinux.org/doku.php?id=faq

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2008-01-21 04:51:54     Re: Adding RAM to blackfin

Andrea Federico (UNITED STATES)

Message: 49879    Hi Paolo,

with rev 0.3 and 128MB I have no problem all runs perfectly, with rev 0.2 it's impossible

to add more ram because it is a software limit for avoid a problem in the revision 0.2.

You can look in the file:

linux-2.6.x/arch/blackfin/kernel/setup.c, search ANOMALY_05000263.

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2008-01-25 15:54:49     Re: Adding RAM to blackfin

Bill Fassler (UNITED STATES)

Message: 50169    Andrea, You got that to work with an address width of 11?  Because if you are using MT48LC32M16A2 I believe that should be 10.

 

Bill

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2008-01-25 16:53:50     Re: Adding RAM to blackfin

Andrea Federico (UNITED STATES)

Message: 50170    Hi Bill,

I did not specify the type of memory and I don't remember and now I'm at home,

but I confirm I use an address width of 11.

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