Re: [PATCH v2 4/4] riscv: dts: spacemit: Add Milk-V Jupiter board (M1)

Hi Aurelien, 


On 18:00 Wed 29 Jul     , Aurelien Jarno wrote:
> Add support for the Milk-V Jupiter board with the M1 CPU. The M1 differs
> from the K1 only by its package, which provides improved cooling
> performance and allows it to run at up to 1.8 GHz instead of 1.6 GHz.
> 
> Add m1-opp.dtsi to define the 1.8 GHz operating point and the
> corresponding core voltage, based on the upstream kernel. Include it
> from m1-milkv-jupiter.dts. Raise the maximum buck1 voltage to 1.116V to
> match the new operating point.
> 
While checking the schematics, the buck1,2 provide power supply both
for cpu core and AVDD09 domain - check schematics page 9/25 [1]

the R81 is NC, so buck1,2 is actually all power supply, raise voltage will
result high risk to damage the chip (overvoltage of AVDD09 domain), so
a safe strategy would to test if M1 able to run at 1.8G without voltage 
change (still at 1.05v)?

Link: https://github.com/milkv-jupiter/jupiter-files/blob/main/hardware/v1_0/jupiter-sch-v1_0.pdf [1]

-- 
Yixun Lan (dlan)