ls1020a disable SERDES module

[ketingxin]

connect SerDes PLL1 and SerDes PLL2 to GND,the ls1020 boot failure.

or

set the RCW control word like this,1020 boot failure too.

#PBL preamble and RCW header
aa55aa55 01ee0100

#enable IFC, disable QSPI and DSPI

bit0-127
0608000c 00000000 00000000 00000000

bit128-255
FF000000 08C08028 60040a00 81046000

(00000000 08408028 60040a00 81046000，the configration of RCW bit128 to255,normal boot )
00000000 00000000 00000000 0002a800
80000100 0004b548 00000000 00000000

[r8070z]

Have a great day,

If the SerDes are unused, the SD1_REF_CLK inputs can be connected to GND, however AVDD_SD1_PLL1, AVDD_SD1_PLL2, S1VDD, X1VDD must remain powered. In the RCW configuration the following RCW bits have to be configured:

  SRDS_PLL_PD_S1 = 2'b11 (both PLLs configured as powered down)

 SRDS_PLL_REF_CLK_SEL_S1 = 2'b00

 SRDS_PRTCL_S1=8'hFF (no other values are permitted when both PLLs are powered down)

As you can see in the https://community.nxp.com/thread/430180 LS1021 can boot with that settings. So the LS1020 should boot too.

It is not clear what do you mean as boot fail. Notice if SerDes in use then after completing reset, software should check the SerDesx_PLLnRSTCTL[RST_DONE] field to make sure that each active SerDes PLL on the device has locked. SerDes PLL will not lock if the corresponding reference clock is not provided. May your software fails due to that checking.

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[ketingxin]

thanks for your reply。

after PBL load the RCW and PBI，the sinal ASLEEP assert。

this boot failure was related to the PBI command（8940007C 21F47300）

[ruizhengxin]

Hi ,I found the similar problem in community,

I'm porting DM8806 L2switch to LS1021a IOT based board, I'd like anyone to give me an answer, hint o... 

but it's no reply:smileysad: