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reserved topmost 32 bytes of RAM used by IAP functions 

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.
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0x6d61726b 2017-04-30 14:16:05 +02:00 committed by GitHub
parent c2fa163322
commit 6c3f9bd485
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targets/TARGET_NXP/TARGET_LPC176X/device/TOOLCHAIN_GCC_CR/LPC1768.ld
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@ -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 */