Add PICO_FLASH_SIZE_BYTES define (#1414)

Matches the flash size defined in the menus.

Fixes #1399

platform.txt

@@ -43,7 +43,7 @@ compiler.warning_flags.more=-Wall -Werror=return-type -Wno-ignored-qualifiers
 compiler.warning_flags.all=-Wall -Wextra -Werror=return-type -Wno-ignored-qualifiers
 
 compiler.netdefines=-DPICO_CYW43_ARCH_THREADSAFE_BACKGROUND=1 -DCYW43_LWIP=1 {build.libpicowdefs} -DLWIP_IGMP=1 -DLWIP_CHECKSUM_CTRL_PER_NETIF=1
-compiler.defines={build.led} {build.usbstack_flags} -DCFG_TUSB_MCU=OPT_MCU_RP2040 {build.usbpid} {build.usbvid} {build.usbpwr} '-DUSB_MANUFACTURER={build.usb_manufacturer}' '-DUSB_PRODUCT={build.usb_product}' {compiler.netdefines} -DARDUINO_VARIANT="{build.variant}" -DTARGET_RP2040
+compiler.defines={build.led} {build.usbstack_flags} -DCFG_TUSB_MCU=OPT_MCU_RP2040 {build.usbpid} {build.usbvid} {build.usbpwr} '-DUSB_MANUFACTURER={build.usb_manufacturer}' '-DUSB_PRODUCT={build.usb_product}' {compiler.netdefines} -DARDUINO_VARIANT="{build.variant}" -DTARGET_RP2040 -DPICO_FLASH_SIZE_BYTES={build.flash_total}
 compiler.includes="-iprefix{runtime.platform.path}/" "@{runtime.platform.path}/lib/platform_inc.txt" "-I{runtime.platform.path}/include"
 compiler.flags=-march=armv6-m -mcpu=cortex-m0plus -mthumb -ffunction-sections -fdata-sections {build.flags.exceptions} {build.flags.stackprotect} {build.flags.cmsis} {build.picodebugflags}
 compiler.wrap="@{runtime.platform.path}/lib/platform_wrap.txt"
@@ -82,6 +82,7 @@ compiler.ar.extra_flags=
 compiler.elf2hex.extra_flags=
 
 # Board configuration, set in boards.txt.  Present here to ensure substitution works
+build.flash_total=
 build.flash_length=
 build.eeprom_start=
 build.flags.optimize=-Os

tools/makeboards.py

@@ -14,6 +14,7 @@ def BuildFlashMenu(name, flashsize, fssizelist):
         mn="%d_%d" % (flashsize, fssize)
         print("%s.menu.flash.%s=%dMB (%s)" % (name, mn, flashsize / (1024 * 1024), fssizename))
         print("%s.menu.flash.%s.upload.maximum_size=%d" % (name, mn, flashsize - 4096 - fssize))
+        print("%s.menu.flash.%s.build.flash_total=%d" % (name, mn, flashsize))
         print("%s.menu.flash.%s.build.flash_length=%d" % (name, mn, flashsize - 4096 - fssize))
         print("%s.menu.flash.%s.build.eeprom_start=%d" % (name, mn, int("0x10000000",0) + flashsize - 4096))
         print("%s.menu.flash.%s.build.fs_start=%d" % (name, mn, int("0x10000000",0) + flashsize - 4096 - fssize))