Use the SDK XIP cache clean method #7
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Add PSRAM support with auto detection. Performs a best-effort attempt to detect attached PSRAM, configure it and *add* it to the MicroPython heap. If PSRAM is not present, should fall back to use internal RAM. Introduce two new port/board defines: * MICROPY_HW_ENABLE_PSRAM to enable PSRAM. * MICROPY_HW_PSRAM_CS_PIN to define the chip-select pin. Changes: ports/rp2/rp2_psram.c/h: Add new PSRAM module. ports/rp2/main.c: Add optional PSRAM support. ports/rp2/CMakeLists.txt: Include rp2_psram.c. ports/rp2/rp2_flash.c: Add buffered write to avoid reads from PSRAM. ports/rp2/mpconfigport.h: Enable MICROPY_GC_SPLIT_HEAP for boards that set MICROPY_HW_ENABLE_PSRAM. Co-authored-by: Kirk Benell <[email protected]> Co-authored-by: Mike Bell <[email protected]> Signed-off-by: Phil Howard <[email protected]>
Signed-off-by: Phil Howard <[email protected]>
Signed-off-by: Phil Howard <[email protected]>
My tests found issues when PSRAM is combined with the existing RAM in a split-heap configuration. Since this option is not enabled by default on RP2 I have changed it to be optional. PSRAM will be used exclusively if MICROPY_GC_SPLIT_HEAP == 0, it will be added to RAM if MICROPY_GC_SPLIT_HEAP == 1, and the system will fall back to RAM only if it's not detected. Signed-off-by: Phil Howard <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Try to avoid causing an upset with USB startup by detecting PSRAM as early as possible. Signed-off-by: Phil Howard <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Move PSRAM setup to immediately after flash timing setup. Disable interrupts while setting up PSRAM. Signed-off-by: Mike Bell <[email protected]>
Enable split heap if PSRAM is enabled. This allows both the internal SRAM and PSRAM to be used as heap. Signed-off-by: Phil Howard <[email protected]>
GC stack was overflowing and causing the GC to scan through the entire memory pool, which is a particularly pathological case with 8MB PSRAM. This caused noticable slowdowns during GC. This change takes the stack from 256 to 4096 bytes to avoid overflow. Co-authored-by: Kirk Benell <[email protected]> Signed-off-by: Phil Howard <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
Signed-off-by: Mike Bell <[email protected]>
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This PR picks up the CMake and linker script changes from #6, and additionally switches to using the new pico-sdk 2.1 method for cleaning the XIP cache.