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[spi_host] Switch from loopback to SD card access#446

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elliotb-lowrisc wants to merge 1 commit intolowRISC:mainfrom
elliotb-lowrisc:spi_sd
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[spi_host] Switch from loopback to SD card access#446
elliotb-lowrisc wants to merge 1 commit intolowRISC:mainfrom
elliotb-lowrisc:spi_sd

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Rework the connections to the SPI Host peripheral to remove the bring-up loopback and replace it with connections to the SD card or a model. For FPGA, this means connecting to the Genesys2 micro-SD card slot. For Verilator, this mean connecting to the SD card model from Sonata.

Not that there is currently no test for spi_host,
as the previous smoketest relied on the loopback connection, and an SD card test has not been ported yet.

Outstanding TODOs remain relating to the card detect signal.

Rework the connections to the SPI Host peripheral to remove the bring-up
loopback and replace it with connections to the SD card or a model.
For FPGA, this means connecting to the Genesys2 micro-SD card slot.
For Verilator, this mean connecting to the SD card model from Sonata.

Not that there is currently no test for spi_host,
as the previous smoketest relied on the loopback connection,
and an SD card test has not been ported yet.

Outstanding TODOs remain relating to the card detect signal.
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