rp2040: Add a Kconfig option for selecting "generic_03H" flash type

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

lib/rp2040/boot_stage2/boot2_generic_03h.S

@@ -16,7 +16,7 @@
 //                4-byte checksum. Therefore code size cannot exceed 252 bytes.
 // ----------------------------------------------------------------------------
 
-#include "pico/asm_helper.S"
+//#include "pico/asm_helper.S"
 #include "hardware/regs/addressmap.h"
 #include "hardware/regs/ssi.h"
 

lib/rp2040/rp2040.patch

@@ -1,3 +1,16 @@
+diff --git a/lib/rp2040/boot_stage2/boot2_generic_03h.S b/lib/rp2040/boot_stage2/boot2_generic_03h.S
+index a10e66abd..cc7e4fbc7 100644
+--- a/lib/rp2040/boot_stage2/boot2_generic_03h.S
++++ b/lib/rp2040/boot_stage2/boot2_generic_03h.S
+@@ -16,7 +16,7 @@
+ //                4-byte checksum. Therefore code size cannot exceed 252 bytes.
+ // ----------------------------------------------------------------------------
+ 
+-#include "pico/asm_helper.S"
++//#include "pico/asm_helper.S"
+ #include "hardware/regs/addressmap.h"
+ #include "hardware/regs/ssi.h"
+ 
 diff --git a/lib/rp2040/boot_stage2/boot2_w25q080.S b/lib/rp2040/boot_stage2/boot2_w25q080.S
 index ad3238e2..8fb3def4 100644
 --- a/lib/rp2040/boot_stage2/boot2_w25q080.S

src/rp2040/Kconfig

@@ -52,12 +52,22 @@ config FLASH_START
 # Bootloader options
 ######################################################################
 
+choice
+    prompt "Flash chip" if LOW_LEVEL_OPTIONS
+    config RP2040_FLASH_W25Q080
+        bool "W25Q080 with CLKDIV 2"
+    config RP2040_FLASH_GENERIC_03
+        bool "GENERIC_03H with CLKDIV 4"
+endchoice
+
 config RP2040_STAGE2_FILE
     string
+    default "boot2_generic_03h.S" if RP2040_FLASH_GENERIC_03
     default "boot2_w25q080.S"
 
 config RP2040_STAGE2_CLKDIV
     int
+    default 4 if RP2040_FLASH_GENERIC_03
     default 2