This patch uses the AXP808 support to raise the Cortex-A7 core voltage from the power-on default of 0.9 V to 1.02 V and increases the clock frequency from the default 1008 MHz to 1200 MHz. This is the maximum clock frequency listed in the vendor's sys_config.fex file.
Signed-off-by: Rask Ingemann Lambertsen rask@formelder.dk --- This patch goes on top of "ARM: sunxi: Add defconfig for Sunchip CX-A99".
FWIW, I seem to get away with
CONFIG_SYS_CLK_FREQ=1296000000 CONFIG_AXP_DCDCA_VOLT=1100
but neither "Allwinner UltraOcta A80 Datasheet" (revision 1.3) nor "Allwinner A80 User Manual" (revision 1.3.1) say anything about the supported clock frequencies.
configs/Sunchip_CX-A99_defconfig | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/configs/Sunchip_CX-A99_defconfig b/configs/Sunchip_CX-A99_defconfig index 7530d7d..3b760d8 100644 --- a/configs/Sunchip_CX-A99_defconfig +++ b/configs/Sunchip_CX-A99_defconfig @@ -4,6 +4,7 @@ CONFIG_MACH_SUN9I=y CONFIG_DRAM_CLK=600 CONFIG_DRAM_ZQ=3881915 CONFIG_DRAM_ODT_EN=y +CONFIG_SYS_CLK_FREQ=1200000000 CONFIG_MMC0_CD_PIN="PH17" CONFIG_MMC_SUNXI_SLOT_EXTRA=2 CONFIG_USB0_VBUS_PIN="PH15" @@ -17,6 +18,7 @@ CONFIG_SPL=y # CONFIG_CMD_IMLS is not set # CONFIG_CMD_FLASH is not set # CONFIG_CMD_FPGA is not set +CONFIG_AXP_DCDCA_VOLT=1020 # CONFIG_SPL_DOS_PARTITION is not set # CONFIG_SPL_ISO_PARTITION is not set # CONFIG_SPL_EFI_PARTITION is not set