394ae65eaf
Adapt the usbd-storage rp2040 example into pm-grid as a composite MIDI+MSC device: - Host sees a 1MB removable drive backed by the upper 1MB of flash (a .filesystem region, NOLOAD so it stays out of the UF2 and survives reflashes). - scsi_command handles the SCSI set (Inquiry / ReadCapacity10/16 / ReadFormatCapacities / Read / Write / ModeSense / RequestSense / TestUnitReady). Reads come from flash via raw pointer; writes accumulate a 4KB block then erase+program the sector with rp2040-flash (wrapped in interrupt::free). - Host owns the FAT format (formats on first use). Unblocks on-device persistence. - Composite poll: usb_dev.poll([&mut midi, &mut scsi]); scsi.poll services commands. Build fixes required by adding rp2040-flash: - rp2040-hal 0.10 -> 0.11 (0.10 + rp2040-flash 0.6 both export the __aeabi_*/ __addsf3 ROM intrinsics -> duplicate symbols). No HAL API breakage. - lto = false + codegen-units = 1 (fat-LTO tripped the same duplicate intrinsic). UF2 stays ~257KB thanks to NOLOAD. defmt logs on block writes + unknown commands. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
32 lines
1.2 KiB
Text
32 lines
1.2 KiB
Text
/* RP2040 (plain Raspberry Pi Pico) memory layout for rp2040-hal + cortex-m-rt.
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The RP2040 boots from a 256-byte second-stage bootloader at the start of flash
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(BOOT2), which then maps the rest of XIP flash and jumps to .text.
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The 2 MB flash is split: 1 MB for the app, 1 MB for the USB Mass Storage
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filesystem (a FAT volume the host reads/writes; written on-device via rp2040-flash). */
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MEMORY {
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BOOT2 : ORIGIN = 0x10000000, LENGTH = 0x100
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FLASH : ORIGIN = 0x10000100, LENGTH = 0x100000 - 0x100
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FILESYSTEM : ORIGIN = 0x10100000, LENGTH = 1M
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RAM : ORIGIN = 0x20000000, LENGTH = 264K
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}
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EXTERN(BOOT2_FIRMWARE)
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SECTIONS {
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/* The second-stage bootloader blob (rp2040_boot2::BOOT_LOADER_W25Q080) lives here. */
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.boot2 ORIGIN(BOOT2) :
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{
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KEEP(*(.boot2));
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} > BOOT2
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} INSERT BEFORE .text;
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SECTIONS {
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/* The Mass Storage filesystem region. NOLOAD: not part of the flashed image (so the UF2 stays
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small and a reflash doesn't wipe the user's files) — the host formats it on first use, and
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the device reads/writes it at runtime via raw-pointer reads + rp2040-flash erase/program. */
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.filesystem (NOLOAD) : ALIGN(4096)
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{
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KEEP(*(.filesystem));
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} > FILESYSTEM
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} INSERT AFTER .text;
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