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Explicitly invalidate cache lines on RP2350 #9752

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Oct 23, 2024
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Explicitly invalidate cache lines on RP2350 #9752

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4 changes: 3 additions & 1 deletion ports/raspberrypi/supervisor/internal_flash.c
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Original file line number Diff line number Diff line change
Expand Up @@ -51,7 +51,9 @@ static void save_psram_settings(void) {
// We're about to invalidate the XIP cache, clean it first to commit any dirty writes to PSRAM
uint8_t *maintenance_ptr = (uint8_t *)XIP_MAINTENANCE_BASE;
for (int i = 1; i < 16 * 1024; i += 8) {
maintenance_ptr[i] = 0;
// Background info: https://forums.raspberrypi.com/viewtopic.php?t=378249
maintenance_ptr[i] = 0; // Clean
maintenance_ptr[i - 1] = 0; // Explicitly invalidate
}

m1_timing = qmi_hw->m[1].timing;
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