Guzunty @ Pi Zero

[UseGitNotSvn]

Good evening everyone,

One thing first: An Guzunty and a Pi are a really enoyable combination, thx for making this work and also for the kits.

I got mine a few weeks ago, assembled it last week, but unfortunately I cannot get it work together with my Pi Zero (I dont have any other Pi at my hands). The soldering is well done, tribble-checked it already, but when I try to use Guzunty loader to get gz_test.xsvf on the CPLD nothing works.

With 'sudo gz_load -v4 -p gz_test.xsvf' I get the following output:

Guzunty loader v5.01 rev 2, portions courtesy Xilinx, Inc.
Verbose level = 4
Progress Indicator suppressed
XSVF file = gz_test.xsvf
sizeof( SXsvfInfo ) = 300 bytes
TMS Reset Sequence -> Test-Logic-Reset
TAP State = RESET
XREPEAT = 32
TMS Reset Sequence -> Test-Logic-Reset
TAP State = RESET
TAP State = RUNTEST/IDLE
XRUNTEST = 0
XSIR length = 8
Shift Length = 8
TDI = 0xfe
TDO Expected =
TAP State = DRSELECT
TAP State = IRSELECT
TAP State = IRCAPTURE
TAP State = IRSHIFT
TAP State = IREXIT1
TAP State = IRUPDATE
TAP State = RUNTEST/IDLE
XSDRSIZE = 32
TDO Mask = 0x0fffffff
Shift Length = 32
TDI = 0x00000000
TDO Expected = 0xf9604093
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TAP State = DRSELECT
TAP State = DRCAPTURE
TAP State = DRSHIFT
TAP State = DREXIT1
TAP State = DRUPDATE
TAP State = RUNTEST/IDLE
TDO Expected = 0xf9604093
TDO Captured = 0x00000000
TDO Mask = 0x0fffffff

ERROR: TDO mismatch and exceeded max retries
ERROR at or near XSVF command #8. See line #8 in the XSVF ASCII file.

ERROR: TDO mismatch and exceeded max retries
Execution Time = 0.052 seconds

My intuation tells me there is something wrong with gz_load trying to emulate the JTAG interface, because it gets no response from the CPLD. A quick test with a different development board (same CPLD though) lead to the same problem. According to Guzunty wiki it should work with Pi Zero. Any hints? I must have missed something?

Regards

[UseGitNotSvn]

After a little digging I fixed the problem. Had to adjust some lines of code in ports.c in gz_load sub directory.

The problem was I am using a 'Raspberry Pi Zero Rev 1.2'. In setup_io() the device tree is read, and the model name of the raspberry Pi is extracted. The 2 within the model name lead to a problem with the current implementation: The software thinks a Pi 2 is used and sets peri_base to BCM2709_PERI_BASE, but BCM2708_PERI_BASE is the right selection for Pi Zero.

After getting around of this, everything worked like a charm.

Cheers

[campbellsan]

Hey great catch!

Could you please raise in a Github pull request? I will merge and publish the fix.

[campbellsan]

Fix pushed. Tested on Pi 3 and Pi Zero (thanks UseGitNotSVN).

I had to forgo the printfs which show what peripheral set was detected because the output corrupts the progress indicator.