reserved topmost 32 bytes of RAM used by IAP functions

0x6d61726b · web-flow · commit 6c3f9bd4850e · 2017-04-30T14:16:05.000+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_CR/LPC1768.ld b/targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_CR/LPC1768.ld
@@ -7,7 +7,7 @@ MEMORY
 {
   /* Define each memory region */
   MFlash512 (rx) : ORIGIN = 0x0, LENGTH = 0x80000 /* 512k */
-  RamLoc32 (rwx) : ORIGIN = 0x100000C8, LENGTH = 0x7F38 /* 32k */
+  RamLoc32 (rwx) : ORIGIN = 0x100000C8, LENGTH = 0x7F18 /* 32k (topmost 32 bytes used by IAP functions) */
   RamAHB_USB (rwx) : ORIGIN = 0x2007c000, LENGTH = 0x4000 /* 16k */
   RamAHB_Eth (rwx) : ORIGIN = 0x20080000, LENGTH = 0x4000 /* 16k */
 

Original file line number	Diff line number	Diff line change
`@@ -7,7 +7,7 @@ MEMORY`
`7`	`7`	`{`
`8`	`8`	`/* Define each memory region */`
`9`	`9`	`MFlash512 (rx) : ORIGIN = 0x0, LENGTH = 0x80000 /* 512k */`
`10`		`- RamLoc32 (rwx) : ORIGIN = 0x100000C8, LENGTH = 0x7F38 /* 32k */`
	`10`	`+ RamLoc32 (rwx) : ORIGIN = 0x100000C8, LENGTH = 0x7F18 /* 32k (topmost 32 bytes used by IAP functions) */`
`11`	`11`	`RamAHB_USB (rwx) : ORIGIN = 0x2007c000, LENGTH = 0x4000 /* 16k */`
`12`	`12`	`RamAHB_Eth (rwx) : ORIGIN = 0x20080000, LENGTH = 0x4000 /* 16k */`
`13`	`13`