Hi

On Fri, Dec 4, 2020 at 10:44 PM Michael Nazzareno Trimarchi michael@amarulasolutions.com wrote:

Hi Peng

I have a design with imx6ull that is running properly according to the manufacturer with the old REFTOP_VBGA set BM_ANADIG_ANA_MISC0_REFTOP_VBGADJ,. With this commit, the TJunction of the CPU is around 8 degree more than without. The commit message does not provide any info

According to the design team, we need to set REFTOP_VBGADJ in PMU MISC0 according to the REFTOP_TRIM[2:0] fuse. the actually table is as below:

  '000" - set REFTOP_VBGADJ[2:0] to 3'b000
  '001" - set REFTOP_VBGADJ[2:0] to 3'b001
  '010" - set REFTOP_VBGADJ[2:0] to 3'b010
  '011" - set REFTOP_VBGADJ[2:0] to 3'b011
  '100" - set REFTOP_VBGADJ[2:0] to 3'b100
  '101" - set REFTOP_VBGADJ[2:0] to 3'b101
  '110" - set REFTOP_VBGADJ[2:0] to 3'b110
  '111" - set REFTOP_VBGADJ[2:0] to 3'b111

Can someone describe to me better? The device needs to run in a very hot environment and 10 to 8 degrees on the junction are really important.

I think that is used as reference temperatur too, for measuring temperature in the processor. I think that i need to ask to us a thermal camera

Michael

In the same environment: temp without this patch 34 temp with is 43

Register value is 0x240080E8 and 0x24008088

Michael

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