Workaround PSRAM cache invalid'n by reading flash #2551
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Fixes #2537 While waiting for a working direct cache flush routine, try and force the cache to evict all PSRAM values by reading a bunch of flash addresses (which share the XIP cache). This hurts performance when PSRAM is not used, but is required for correctness until we have a working XIP flush.
gmx from the RPI forums came up with this hack and it seems to work! https://forums.raspberrypi.com/viewtopic.php?p=2262371#p2262371
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Fixes #2537
While waiting for a working direct cache flush routine, try and force the cache to evict all PSRAM values by reading a bunch of flash addresses (which share the XIP cache). This hurts performance when PSRAM is not used, but is required for correctness until we have a working XIP flush.