On Sat, 12 Jun 2021 07:50:27 +0200 Jernej Škrabec jernej.skrabec@gmail.com wrote:
Hi,
Dne ponedeljek, 07. junij 2021 ob 19:42:45 CEST je Jernej Skrabec napisal(a):
OrangePi PC2 board has DRAM with ODT, so enable it. ZQ value is also slightly different in vendor images, so update it as well. H5 SoC is also connected to voltage regulator. It's default value is pretty low, so in order to avoid instability, enable driver for it and set it to appropriate voltage.
Signed-off-by: Jernej Skrabec jernej.skrabec@gmail.com
configs/orangepi_pc2_defconfig | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/configs/orangepi_pc2_defconfig b/configs/orangepi_pc2_defconfig index f72ffe27b26c..5e4cca793f53 100644 --- a/configs/orangepi_pc2_defconfig +++ b/configs/orangepi_pc2_defconfig @@ -3,13 +3,15 @@ CONFIG_ARCH_SUNXI=y CONFIG_SPL=y CONFIG_MACH_SUN50I_H5=y CONFIG_DRAM_CLK=672 -CONFIG_DRAM_ZQ=3881977 -# CONFIG_DRAM_ODT_EN is not set +CONFIG_DRAM_ZQ=4145117 CONFIG_MACPWR="PD6" CONFIG_SPL_SPI_SUNXI=y +CONFIG_SPL_I2C_SUPPORT=y CONFIG_DEFAULT_DEVICE_TREE="sun50i-h5-orangepi-pc2" # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set CONFIG_SUN8I_EMAC=y +CONFIG_SY8106A_POWER=y +CONFIG_SY8106A_VOUT1_VOLT=1100
I'm not sure if voltage regulator adjustment needs to be enabled. By default, it's set to 1.1 V using resistor divider. However, it can be still needed if board is rebooted and OS set it to lower value before reboot.
Yeah, I had a similar train of thoughts: originally I though we don't need it, because of the resistor divider providing a good default voltage. But indeed if we reset from a lower p-state (either by chance or because of say the powersave governor being active), I really see the lowest voltage (1.0V) being still set in when back in U-Boot, which could lead to instabilities if the CPU runs at the 816 MHz we set the PLL to. So enabling the regulator sounds indicated, as we set the CPU frequency as well. This is especially critical when the OS doesn't use DVFS.
Because of this I am inclined to take the regulator part now.
For the ODT change, I will queue this for the next release.
Thanks, Andre.
Best regards, Jernej
CONFIG_USB_EHCI_HCD=y CONFIG_USB_OHCI_HCD=y CONFIG_USB_MUSB_GADGET=y -- 2.31.1