No problem...
I found the file I changed. Note that this was part of u-boot-2013.10,
so I don't know how much of this has changed since then.
The change was in board/freescale/imx/ddr/mx6d_1x_mt41j128.cfg...
DATA 4 0x021b0000 0x83180000
To change something in the MMDC.
IIRC, this is a file that is preprocessed by uboot tools to become part
of the
initial image that is sucked in at initial bootload stages to configure
the DDR.
HTH,
Ed
Thank you ED for your reply.
Actually I'm in the prototyping phase. so actually I'm just thinking
about how much ram I will need and for cost optimization I need to think
off which part I can safely remove.
There's no hurry for that. After writing to the ML I found that in the
register ESDCTL that there's an option for setting the 16 bit.
I see that the register is used in this file:
http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/board/freescale/mx53_loco/flash_header.S?h=imx_v2009.08
so ideally if I set: REG_LD_AND_STR_OP(31, 0x000, 0xc3190000) to
REG_LD_AND_STR_OP(31, 0x000, 0xc3180000)
I should be able to set the micro DDR interface to 16 bit mode.
Only if you remember that. Looks this one a solution like the one you
did?
Thank you
Andrea
Il giorno ven, 27/03/2015 alle 14.06 +0100, Ed Sutter ha scritto:
Andrea,
A while back the first spin of our iMX6 based board had a bug that
messed up the upper
16 bits or our 32-bit DRAM interface. I was able to temporarily run
this as a single bank
in 16 bit mode. This was not with yocto however. I would have to dig a
bit to recall what I
had to change (I don't think it was the file you're pointing to); let me
know if you
need that.
Ed
Hello everybody,
I would like to know what is the minimum requirement of ram that I need
to put on the board.
I saw for example that I can use MT41K128M16JT-125 XIT from Micron.
it looks like it is a 16 bit ram.
I know that for a project the ram usage is really low. It is a 16bit
ddr3. I didn't understand if I can use only 1 ram bank or if I need to
use (at least 2). On IMX53qsb there's 4 banks but reading:
http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/tree/include/configs/mx53_loco.h?h=imx_v2009.08
it looks like that I can define CONFIG_NR_DRAM_BANKS to 1. 1 bank of
32bit? or I can use 1 bank of 16bit?
Thank you for the reading
Andrea
--
Ed Sutter
Alcatel-Lucent Technologies -- Bell Laboratories
Phone: 908-582-2351
Email: [email protected]
--
Ed Sutter
Alcatel-Lucent Technologies -- Bell Laboratories
Phone: 908-582-2351
Email: [email protected]
--
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