machine: Add support for Adafruit QT2040 board.

targets/trinkey-qt2040-boot-stage2.S

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+// Adafruit Trinkey QT2040 Stage 2 Bootloader
+
+//
+// This file defines the parameters specific to the flash-chip found
+// on the Adafruit Trinkey QT2040.  The generic implementation is in
+// rp2040-boot-stage2.S
+//
+
+#define BOARD_PICO_FLASH_SPI_CLKDIV   4
+#define BOARD_CMD_READ                0xe7
+#define BOARD_QUAD_OK                 1
+#define BOARD_QUAD_ENABLE_STATUS_BYTE 2
+#define BOARD_QUAD_ENABLE_BIT_MASK    2
+#define BOARD_SPLIT_STATUS_WRITE      1
+#define BOARD_WAIT_CYCLES             2
+
+#include "rp2040-boot-stage2.S"

targets/trinkey-qt2040.json

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+{
+    "inherits": [
+        "rp2040"
+    ],
+    "serial-port": ["acm:239a:8109"],
+    "build-tags": ["trinkey_qt2040"],
+    "linkerscript": "targets/trinkey-qt2040.ld",
+    "extra-files": [
+        "targets/trinkey-qt2040-boot-stage2.S"
+    ]
+}

targets/trinkey-qt2040.ld

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+
+MEMORY
+{
+    /* Reserve exactly 256 bytes at start of flash for second stage bootloader */
+    BOOT2_TEXT (rx) : ORIGIN = 0x10000000, LENGTH = 256
+    FLASH_TEXT (rx) : ORIGIN = 0x10000000 + 256, LENGTH = 8192K - 256
+    RAM (rwx)       : ORIGIN = 0x20000000, LENGTH = 256k
+}
+
+INCLUDE "targets/rp2040.ld"