u-boot/board/toradex/colibri_imx7
Stefan Agner a19797b22c colibri_imx7: improve DDR3 timing
This makes sure that all Colibri iMX7 modules work with the
same timing. The changes are:
- Disable ODT on read (JEDEC standard JESD79-3F says in chapter
  5.2.3 ODT during Reads: "As the DDR3 SDRAM can not terminate
  and drive at the same time, RTT must be disabled at least half
  a clock cycle..." and also MX7D SABRESD is disabling it)
  This alone fixed memory issues for two Colibri iMX7 1GB modules
  which showed issues before
- Make sure tRFC(min) is at least 260ns
- Make sure tRC is >50.625ns
- tRP needs to be >13.125ns, we can lower from 18.75ns to 15ns
- tFAW is not relevant, leave at reset

Signed-off-by: Stefan Agner <stefan.agner@toradex.com>
Acked-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
2018-07-23 10:56:38 +02:00
..
colibri_imx7.c colibri_imx7: add compatible string used in vanilla Linux 2018-07-23 10:56:27 +02:00
imximage.cfg colibri_imx7: improve DDR3 timing 2018-07-23 10:56:38 +02:00
Kconfig apalis/colibri_imx7/pxa270/t20/t30/vf: integrate config block handling 2016-11-28 15:10:33 -05:00
MAINTAINERS colibri_imx7: add Colibri iMX7S/iMX7D module support 2016-07-28 13:27:19 +02:00
Makefile SPDX: Convert all of our single license tags to Linux Kernel style 2018-05-07 09:34:12 -04:00