stm32f3x: Allow overriding the flash bank size

Same mechanism as in stm32f1x.cfg reused here.

Change-Id: I81f02feb2b655e8259341b22180f3a8b82e28d05
Signed-off-by: Andreas Fritiofson <[email protected]>
Reviewed-on: https://review.openocd.org/c/openocd/+/7438
Tested-by: jenkins
Reviewed-by: Antonio Borneo <[email protected]>

Author: nattgris

tcl/target/stm32f3x.cfg

@@ -24,6 +24,14 @@ if { [info exists WORKAREASIZE] } {
    set _WORKAREASIZE 0x4000
 }
 
+# Allow overriding the Flash bank size
+if { [info exists FLASH_SIZE] } {
+   set _FLASH_SIZE $FLASH_SIZE
+} else {
+   # autodetect size
+   set _FLASH_SIZE 0
+}
+
 # JTAG speed should be <= F_CPU/6. F_CPU after reset is 8MHz, so use F_JTAG = 1MHz
 #
 # Since we may be running of an RC oscilator, we crank down the speed a
@@ -63,7 +71,7 @@ target create $_TARGETNAME cortex_m -endian $_ENDIAN -dap $_CHIPNAME.dap
 $_TARGETNAME configure -work-area-phys 0x20000000 -work-area-size $_WORKAREASIZE -work-area-backup 0
 
 set _FLASHNAME $_CHIPNAME.flash
-flash bank $_FLASHNAME stm32f1x 0 0 0 0 $_TARGETNAME
+flash bank $_FLASHNAME stm32f1x 0 $_FLASH_SIZE 0 0 $_TARGETNAME
 
 reset_config srst_nogate