u-boot/arch/arm/cpu
Siarhei Siamashka 7e40e1926a sunxi: dram: Remove broken impedance and ODT configuration code
We can safely remove it, because none of the currently supported
boards uses these features.

The existing implementation had multiple problems:
   - unnecessary code duplication between sun4i/sun5i/sun7i
   - ZQ calibration was never initiated explicitly, and could be
     only triggered by setting the highest bit in the 'zq' parameter
     in the 'dram_para' struct (this was never actually done for
     any of the known Allwinner devices).
   - even if the ZQ calibration could be started, no attempts were
     made to wait for its completion, or checking whether the
     default automatically initiated ZQ calibration is still
     in progress
   - ODT was only ever enabled on sun4i, but not on sun5i/sun7i

Additionally, SDR_IOCR was set to 0x00cc0000 only on sun4i. There
are some hints in the Rockchip Linux kernel sources, indicating
that these bits are related to the automatic I/O power down
feature, which is poorly understood on sunxi hardware at the
moment. Avoiding to set these bits on sun4i too does not seem to
have any measurable/visible impact.

The impedance and ODT configuration code will be re-introdeced in
one of the next comits.

Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
2014-08-12 08:42:32 +02:00
..
arm720t spl: consolidate arch/arm/include/asm/arch-*/spl.h 2014-06-06 10:05:34 +02:00
arm920t arm: ep9315: Return back Cirrus Logic EDB9315A board support 2014-07-04 23:45:48 +02:00
arm926ejs ARM: kirkwood: add mvsdio driver 2014-08-01 18:44:56 +03:00
arm946es arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
arm1136 arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
arm1176 arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
arm_intcm arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
armv7 sunxi: dram: Remove broken impedance and ODT configuration code 2014-08-12 08:42:32 +02:00
armv8 ARMv8/ls2085a_emu: Add LS2085A emulator and simulator board support 2014-07-04 19:48:41 +02:00
at91-common ARM: atmel: switch to main crystal osc for SPL boot 2014-05-27 00:10:40 +02:00
pxa arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
sa1100 arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
tegra-common ARM: tegra: add function to enable input clamping on tristate 2014-05-13 10:41:31 -07:00
tegra20-common Merge branch 'u-boot/master' 2014-05-09 11:50:14 +02:00
tegra30-common ARM: tegra: Tegra30 pinmux cleanup 2014-04-17 08:41:05 -07:00
tegra114-common ARM: tegra: Tegra114 pinmux cleanup 2014-04-17 08:41:06 -07:00
tegra124-common ARM: tegra: Tegra124 pinmux cleanup 2014-04-17 08:41:06 -07:00
Makefile kbuild: use boolean macros to select tegra*-common directory 2014-04-17 17:44:35 -04:00
u-boot-spl.lds arm: move exception handling out of start.S files 2014-05-15 16:24:53 +02:00
u-boot.lds ARM: HYP/non-sec: add separate section for secure code 2014-07-28 17:07:23 +02:00