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Update PSRAM cache flush algorithm #2563

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Oct 28, 2024
Merged

Update PSRAM cache flush algorithm #2563

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10 changes: 5 additions & 5 deletions cores/rp2040/flash_wrapper.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -26,11 +26,11 @@

#if defined(PICO_RP2350) && defined(RP2350_PSRAM_CS)
static void __no_inline_not_in_flash_func(flushcache)() {
for (volatile uint8_t* cache = (volatile uint8_t*)0x18000001; cache < (volatile uint8_t*)(0x18000001 + 2048 * 8); cache += 8) {
*cache = 0;
__compiler_memory_barrier();
*(cache - 1) = 0;
__compiler_memory_barrier();
// From https://forums.raspberrypi.com/viewtopic.php?t=378249#p2263677
// Perform clean-by-set/way on all lines
for (uint32_t i = 0; i < 2048; ++i) {
// Use the upper 16k of the maintenance space (0x1bffc000 through 0x1bffffff):
*(volatile uint8_t*)(XIP_SRAM_BASE + (XIP_MAINTENANCE_BASE - XIP_BASE) + i * 8u + 0x1u) = 0;
}
}
#elif defined(PICO_RP2350)
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