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Disable JTAG so that GPIO0 can be used? (On a LIMA module)
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jstep
Joined: 02 Jan 2019, 15:15
Posts: 6
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Hi, I need to be able to use GPIO0 (as a chipselect for SPI) but from the reading I have been doing, this is only possible if I disable the JTAG interface.
Please help, how do I disable the JTAG interface?
Thank you!
Joe
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| 03 Jan 2019, 18:07 |
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pepe2k
Joined: 11 Mar 2012, 18:42
Posts: 37
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| 07 Jan 2019, 19:26 |
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jstep
Joined: 02 Jan 2019, 15:15
Posts: 6
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Thank you
In case anyone comes across this in the future;
We were able to disable the JTAG and use GPIO0 by first compiling a new busybox which includes the 'devmem' function, then using busybox devmem we were able to change the Memory at address 0x1804006C from 0x00000020 to 0x00000022 (set bit 1 to 1).
./busybox devmem 0x1804006C 32 0x00000022
After doing this, GPIO0 can then be manipulated using the traditional methods.
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| 10 Jan 2019, 17:03 |
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