reserved topmost 32 bytes of RAM used by IAP functions

0x6d61726b · web-flow · commit 0125f9f1a1ec · 2017-04-30T14:14:04.000+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_ARM_STD/LPC1768.sct b/targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_ARM_STD/LPC1768.sct
@@ -6,8 +6,8 @@ LR_IROM1 0x00000000 0x80000  {    ; load region size_region
    .ANY (+RO)
   }
   ; 8_byte_aligned(49 vect * 4 bytes) =  8_byte_aligned(0xC4) = 0xC8
-  ; 32KB - 0xC8 = 0x7F38
-  RW_IRAM1 0x100000C8 0x7F38  {
+  ; 32KB (RAM size) - 0xC8 (NIVT) - 32 (topmost 32 bytes used by IAP functions) = 0x7F18
+  RW_IRAM1 0x100000C8 0x7F18  {
    .ANY (+RW +ZI)
   }
   RW_IRAM2 0x2007C000 0x4000  {  ; RW data, ETH RAM

Original file line number	Diff line number	Diff line change
`@@ -6,8 +6,8 @@ LR_IROM1 0x00000000 0x80000 { ; load region size_region`
`6`	`6`	`.ANY (+RO)`
`7`	`7`	`}`
`8`	`8`	`; 8_byte_aligned(49 vect * 4 bytes) = 8_byte_aligned(0xC4) = 0xC8`
`9`		`- ; 32KB - 0xC8 = 0x7F38`
`10`		`- RW_IRAM1 0x100000C8 0x7F38 {`
	`9`	`+ ; 32KB (RAM size) - 0xC8 (NIVT) - 32 (topmost 32 bytes used by IAP functions) = 0x7F18`
	`10`	`+ RW_IRAM1 0x100000C8 0x7F18 {`
`11`	`11`	`.ANY (+RW +ZI)`
`12`	`12`	`}`
`13`	`13`	`RW_IRAM2 0x2007C000 0x4000 { ; RW data, ETH RAM`