Revert "fix streaming & spuriously wrong data"

This reverts commit f6d799cd8d52b96168b4757de2b276922e1e2e18.

Revert "once more with feeling"

This reverts commit ca7805d300f6c7b1fc93c9b8953ba44dac4b2dbb.
Fix SPI stalls: Enable INACK to prevent overruns