topic Re: gpio test in U-boot for LS1021ATWR in Layerscape

gpio test in U-boot for LS1021ATWR

niexuzhong — Fri, 18 Jun 2021 07:50:31 GMT

I want to test the GPIO function for LS1021ATWR for uboot, After I check schematic, I choose GPIO3_03 pin to test it. first I change EC1=1 in rcw file. then compile the rcw file and modify the uboot image. the RCW during start is as following:

00000000: 0608000a 00000000 00000000 00000000
00000010: 30000000 00007900 60040a00 21046000
00000020: 00000000 00000000 00000000 20000000
00000030: 00080000 281b7340 00000000 00000000

So the GPIO3[2:14]pin had been set as GPIO pin. The B42 pin of primary connector is GPIO3_03,

The GPIO3 direction register is 0x2320000, the data regsiter is 0x2320008. so I use command

mw 0x02320000 8 1 to set GPIO3_03 as output. ,the 0x02320004 is 0x00000000, then I use command

mv 0x02320008 8 1

but I check the voltage of B42. The voltage of B42 is still low. I don't know if there is error in my operations. Who can give me some suggestions? Thank you!

Re: gpio test in U-boot for LS1021ATWR

ufedor — Sat, 19 Jun 2021 09:59:59 GMT

Please try:

mw 0x02320000 10000000

mw 0x02320008 10000000

Re: gpio test in U-boot for LS1021ATWR

niexuzhong — Mon, 21 Jun 2021 01:00:56 GMT

mw 0x023200000 10000000

mw 0x023200008 10000000

Does such instruction is to test pin 28 of GPIO3? I test it as your instruction. but the result is same

Re: gpio test in U-boot for LS1021ATWR

ufedor — Mon, 21 Jun 2021 04:52:25 GMT

After:

mw 23200000 10000000

mw 23200008 10000000

Please provide output of:

md 23200000 4

Re: gpio test in U-boot for LS1021ATWR

niexuzhong — Mon, 21 Jun 2021 05:12:16 GMT

=> mw 02320000 10000000
=> mw 02320008 10000000
=> md 02320000 4
02320000: 10000000 00000000 0000be15 0000be15 ................

Re: gpio test in U-boot for LS1021ATWR

niexuzhong — Tue, 22 Jun 2021 05:40:01 GMT

who can give me more suggestions? Thanks