u-boot/arch
SRICHARAN R 42d4f37b79 ARM: OMAP5: DDR3: Change io settings
The change from 0x64656465 to 0x64646464 is to remove the weak pull
enabled on DQS, nDQS lines. This pulls the differential signals in the
same direction which is not intended. So disabling the weak pulls improves
signal integrity.

On the uEVM there are 4 DDR3 devices.  The VREF for 2 of the devices is powered by
the OMAP's VREF_CA_OUT pins.  The VREF on the other 2 devices is powered by the OMAP's
VREF_DQ_OUT pins.  So the net effect here is that only half of the DDR3 devices were being
supplied a VREF!  This was clearly a mistake.  The second change improves the robustness of
the interface and was specifically seen to cure corruption observed at high temperatures
on some boards.

With the above two changes better memory stability was observed with extended
temperature ranges around 100C.

Signed-off-by: Sricharan R <r.sricharan@ti.com>
2013-11-01 15:56:00 -04:00
..
arm ARM: OMAP5: DDR3: Change io settings 2013-11-01 15:56:00 -04:00
avr32 Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
blackfin Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
m68k Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
microblaze microblaze: Fix watchdog initialization 2013-10-16 09:24:38 -04:00
mips Coding Style cleanup: remove trailing white space 2013-10-14 16:06:53 -04:00
nds32 nds32: introduce DMA allocation API 2013-08-09 01:51:11 +08:00
nios2 Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
openrisc Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
powerpc Coding Style cleanup: replace leading SPACEs by TABs 2013-10-14 16:06:54 -04:00
sandbox Coding Style cleanup: remove trailing white space 2013-10-14 16:06:53 -04:00
sh Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
sparc Add GPL-2.0+ SPDX-License-Identifier to source files 2013-07-24 09:44:38 -04:00
x86 Coding Style cleanup: remove trailing white space 2013-10-14 16:06:53 -04:00
.gitignore update include/asm/ gitignore after move 2010-05-07 00:17:30 +02:00