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DAC+ DSP SPI Issues

Hardware: Raspberry Pi 4B, HiFiBerry DAC+ DSP

OS: Rapbian Buster Lite

Installation: as outlined in https://github.com/hifiberry/hifiberry-dsp

Issue: 

- on boot: `dsptoolkit get-checksum` returns empty, `dsptoolkit get-xml` returns expected xml

- after `dsptoolkit install-profile blah.xml`: `dsptoolkit get-checksum` returns empty, `dsptoolkit get-xml` returns `None`

- after `dsptoolkit reset`: `dsptoolkit get-checksum` returns empty, `dsptoolkit get-xml` returns `None`

- `sudo systemctl status sigmatcp`: gives error that SPI returns zeros

Fix attempts:

- fresh installation on new SD card

- physically remove and reinstall HiFiBerry DAC+ DSP

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