Add assembly bare metal blink examble for rp2350.

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

bare_metal/rp2350/blink/min_arm_image_def.s

@@ -0,0 +1,37 @@
+// SPDX-FileCopyrightText: 2024 Mete Balci
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// ref: RP2350 datasheet 5.9.5.1. Minimum Arm IMAGE_DEF
+
+// this is a single block with two items (IMAGE_TYPE and LAST) in it
+
+// include this section in linker description in the first 4K of a flash image
+.section .picobin_block, "a"
+
+.word 0xffffded3 // PICOBIN_BLOCK_MARKER_START
+
+// item 0 IMAGE_TYPE
+
+.byte 0x42 // PICOBIN_BLOCK_ITEM_1BS_IMAGE_TYPE
+.byte 0x1 // item is 1 word
+// Try Before You Buy - 0 (not set)
+// Chip - b001 (RP2350)
+// reserved - 0b0
+// CPU - b000 (ARM)
+// reserved - 0b00
+// EXE Security - 0b10 (Secure mode)
+// Image Type - 0b0001 (EXE)
+.hword 0b0001000000100001
+
+// item 1 LAST
+
+.byte 0xff // PICOBIN_BLOCK_ITEM_2BS_LAST
+.hword 0x0001 // item is 1 word
+.byte 0 // pad
+
+// relative pointer to next block in loop
+// 0 means a link to itself, meaning there is no other block
+.word 0
+
+.word 0xab123579 // PICOBIN_BLOCK_MARKER_END