[U-Boot] [PATCH] sunxi: Remove Orangepi PC RAM speed to 624 MHz
There are some reports of stability issues at 672 MHz, see: http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit
So reduce the DRAM speed to 624MHz which seems to be reliable everywhere.
Signed-off-by: Hans de Goede hdegoede@redhat.com --- configs/orangepi_pc_defconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configs/orangepi_pc_defconfig b/configs/orangepi_pc_defconfig index 75afca9..358caa5 100644 --- a/configs/orangepi_pc_defconfig +++ b/configs/orangepi_pc_defconfig @@ -1,7 +1,7 @@ CONFIG_ARM=y CONFIG_ARCH_SUNXI=y CONFIG_MACH_SUN8I_H3=y -CONFIG_DRAM_CLK=672 +CONFIG_DRAM_CLK=624 CONFIG_DRAM_ZQ=3881979 CONFIG_DRAM_ODT_EN=y # CONFIG_VIDEO is not set
On Wed, 2015-12-23 at 11:50 +0100, Hans de Goede wrote:
There are some reports of stability issues at 672 MHz, see: http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit
Looks like only one (in that table at least)? And do we expect this data to remain in the wiki, I suppose so.
In any case, this...
So reduce the DRAM speed to 624MHz which seems to be reliable everywhere.
...seems reasonable to me.
Signed-off-by: Hans de Goede hdegoede@redhat.com
Acked-by: Ian Campbell ijc@hellion.org.uk
Hi,
On 24-12-15 17:08, Ian Campbell wrote:
On Wed, 2015-12-23 at 11:50 +0100, Hans de Goede wrote:
There are some reports of stability issues at 672 MHz, see: http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit
Looks like only one (in that table at least)?
Correct, but another 7 out of 13 are only just reliable at 672 and fail one speed step higher, showing that the manufacturer default of 672 is cutting it awfully close to the failure point, this feels like the factory default is actually an overclocked setting.
And do we expect this data to remain in the wiki, I suppose so.
Ack.
In any case, this...
So reduce the DRAM speed to 624MHz which seems to be reliable everywhere.
...seems reasonable to me.
Signed-off-by: Hans de Goede hdegoede@redhat.com
Acked-by: Ian Campbell ijc@hellion.org.uk
Thanks,
Hans
"Hans" == Hans de Goede hdegoede@redhat.com writes:
There are some reports of stability issues at 672 MHz, see: http://linux-sunxi.org/Orange_Pi_PC#DRAM_clock_speed_limit
So reduce the DRAM speed to 624MHz which seems to be reliable everywhere.
With the subject s/Remove/Reduce/
Acked-by: Peter Korsgaard peter@korsgaard.com
Signed-off-by: Hans de Goede hdegoede@redhat.com
configs/orangepi_pc_defconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/configs/orangepi_pc_defconfig b/configs/orangepi_pc_defconfig index 75afca9..358caa5 100644 --- a/configs/orangepi_pc_defconfig +++ b/configs/orangepi_pc_defconfig @@ -1,7 +1,7 @@ CONFIG_ARM=y CONFIG_ARCH_SUNXI=y CONFIG_MACH_SUN8I_H3=y -CONFIG_DRAM_CLK=672 +CONFIG_DRAM_CLK=624 CONFIG_DRAM_ZQ=3881979 CONFIG_DRAM_ODT_EN=y
# CONFIG_VIDEO is not set
2.5.0
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