reserved topmost 32 bytes of RAM used by IAP functions

0x6d61726b · web-flow · commit c2fa1633227c · 2017-04-30T14:15:23.000+02:00
NXP LPC176x/5x User Manual UM10360 Rev 4.1:
32.3.2.8 RAM used by IAP command handler
Flash programming commands use the top 32 bytes of on-chip RAM. The maximum stack 
usage in the user allocated stack space is 128 bytes and it grows downwards.
diff --git a/targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_ARM/TARGET_XBED_LPC1768/XBED_LPC1768.ld b/targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_ARM/TARGET_XBED_LPC1768/XBED_LPC1768.ld
@@ -4,7 +4,7 @@
 MEMORY
 {
   FLASH (rx) : ORIGIN = 0x00002000, LENGTH = 504K
-  RAM (rwx) : ORIGIN = 0x100000C8, LENGTH = (32K - 0xC8)
+  RAM (rwx) : ORIGIN = 0x100000C8, LENGTH = (32K - 0xC8 - 32)  /* topmost 32 bytes used by IAP functions */
 
   USB_RAM(rwx) : ORIGIN = 0x2007C000, LENGTH = 16K
   ETH_RAM(rwx) : ORIGIN = 0x20080000, LENGTH = 16K

Original file line number	Diff line number	Diff line change
`@@ -4,7 +4,7 @@`
`4`	`4`	`MEMORY`
`5`	`5`	`{`
`6`	`6`	`FLASH (rx) : ORIGIN = 0x00002000, LENGTH = 504K`
`7`		`- RAM (rwx) : ORIGIN = 0x100000C8, LENGTH = (32K - 0xC8)`
	`7`	`+ RAM (rwx) : ORIGIN = 0x100000C8, LENGTH = (32K - 0xC8 - 32) /* topmost 32 bytes used by IAP functions */`
`8`	`8`
`9`	`9`	`USB_RAM(rwx) : ORIGIN = 0x2007C000, LENGTH = 16K`
`10`	`10`	`ETH_RAM(rwx) : ORIGIN = 0x20080000, LENGTH = 16K`