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.