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| author | Siarhei Siamashka <siarhei.siamashka@gmail.com> | 2015-02-01 00:27:05 +0200 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2015-02-02 14:04:15 +0100 |
| commit | d133647af4d4fdaaf2dfb6a9e757c7aebd00a29e (patch) | |
| tree | 34cd14a0422fd91a3068edaf24bfceba3300618d /board/sunxi/Kconfig | |
| parent | fb75d972eaf5c887ada28e73d3e84d52931d4cb0 (diff) | |
| download | u-boot-imx-d133647af4d4fdaaf2dfb6a9e757c7aebd00a29e.zip u-boot-imx-d133647af4d4fdaaf2dfb6a9e757c7aebd00a29e.tar.gz u-boot-imx-d133647af4d4fdaaf2dfb6a9e757c7aebd00a29e.tar.bz2 | |
sunxi: dram: Optionally use standard JEDEC timings for sun[457]i
In addition to the current Android magic settings, allow to optionally use
DDR3 timing parameters, which are tailored for different clock frequencies
and JEDEC speed bins. This should improve reliability and performance.
Adding '+S:CONFIG_DRAM_TIMINGS_DDR3_1066F_1333H=y' to the board defconfig
allows to use timings, which are calculated for the DDR3-1066F speed bin.
A lot of DDR3 chips, which are used in real Allwinner based devices,
support DDR3-1066F speed bin timings.
And adding '+S:CONFIG_DRAM_TIMINGS_DDR3_800E_1066G_1333J=y' should work
with any DDR3 chips, because this targets the slowest JEDEC speed bins.
The vendor magic values are still used by default for DRAM, but board
maintainers now have more flexibility in DRAM timings selection.
Signed-off-by: Siarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'board/sunxi/Kconfig')
| -rw-r--r-- | board/sunxi/Kconfig | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig index adbd2b5..da4e8ba 100644 --- a/board/sunxi/Kconfig +++ b/board/sunxi/Kconfig @@ -55,6 +55,38 @@ config DRAM_EMR1 default 4 if MACH_SUN5I || MACH_SUN7I ---help--- Set the dram controller emr1 value. + +choice + prompt "sunxi dram timings" + default DRAM_TIMINGS_VENDOR_MAGIC + ---help--- + Select the timings of the DDR3 chips. + +config DRAM_TIMINGS_VENDOR_MAGIC + bool "Magic vendor timings from Android" + ---help--- + The same DRAM timings as in the Allwinner boot0 bootloader. + +config DRAM_TIMINGS_DDR3_1066F_1333H + bool "JEDEC DDR3-1333H with down binning to DDR3-1066F" + ---help--- + Use the timings of the standard JEDEC DDR3-1066F speed bin for + DRAM_CLK <= 533MHz and the timings of the DDR3-1333H speed bin + for DRAM_CLK > 533MHz. This covers the majority of DDR3 chips + used in Allwinner A10/A13/A20 devices. In the case of DDR3-1333 + or DDR3-1600 chips, be sure to check the DRAM datasheet to confirm + that down binning to DDR3-1066F is supported (because DDR3-1066F + uses a bit faster timings than DDR3-1333H). + +config DRAM_TIMINGS_DDR3_800E_1066G_1333J + bool "JEDEC DDR3-800E / DDR3-1066G / DDR3-1333J" + ---help--- + Use the timings of the slowest possible JEDEC speed bin for the + selected DRAM_CLK. Depending on the DRAM_CLK value, it may be + DDR3-800E, DDR3-1066G or DDR3-1333J. + +endchoice + endif config SYS_CONFIG_NAME |