Make use of the other 32K of RAM if not used by libraries, least priority is IRAM1 to help maximise heap availability.

chrissnow · chrissnow · commit f801a61138f5 · 2019-08-13T13:41:18.000+01:00
Most beneficial when LWIP is not in use.
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
@@ -29,17 +29,20 @@ LR_IROM1 MBED_APP_START MBED_APP_SIZE  {    ; load region size_region
   ; 8_byte_aligned(49 vect * 4 bytes) =  8_byte_aligned(0xC4) = 0xC8
   ; 32KB (RAM size) - 0xC8 (NIVT) - 32 (topmost 32 bytes used by IAP functions) = 0x7F18
   RW_IRAM1 0x100000C8 0x7F18-Stack_Size  {
-   .ANY (+RW +ZI)
+   .ANY1 (+RW +ZI)
   }
   ARM_LIB_STACK (0x100000C8+0x7F18) EMPTY -Stack_Size { ; stack
   }
   RW_IRAM2 0x2007C000 0x4000  {  ; RW data, ETH RAM
    .ANY (AHBSRAM0)
+   .ANY2 (+RW +ZI)
   }
   RW_IRAM3 0x20080000 0x4000  {  ; RW data, ETH RAM
    .ANY (AHBSRAM1)
+   .ANY3 (+RW +ZI)
   }
   RW_IRAM4 0x40038000 0x0800  {  ; RW data, CAN RAM
    .ANY (CANRAM)
+   .ANY4 (+RW +ZI)
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -29,17 +29,20 @@ LR_IROM1 MBED_APP_START MBED_APP_SIZE { ; load region size_region`
`29`	`29`	`; 8_byte_aligned(49 vect * 4 bytes) = 8_byte_aligned(0xC4) = 0xC8`
`30`	`30`	`; 32KB (RAM size) - 0xC8 (NIVT) - 32 (topmost 32 bytes used by IAP functions) = 0x7F18`
`31`	`31`	`RW_IRAM1 0x100000C8 0x7F18-Stack_Size {`
`32`		`- .ANY (+RW +ZI)`
	`32`	`+ .ANY1 (+RW +ZI)`
`33`	`33`	`}`
`34`	`34`	`ARM_LIB_STACK (0x100000C8+0x7F18) EMPTY -Stack_Size { ; stack`
`35`	`35`	`}`
`36`	`36`	`RW_IRAM2 0x2007C000 0x4000 { ; RW data, ETH RAM`
`37`	`37`	`.ANY (AHBSRAM0)`
	`38`	`+ .ANY2 (+RW +ZI)`
`38`	`39`	`}`
`39`	`40`	`RW_IRAM3 0x20080000 0x4000 { ; RW data, ETH RAM`
`40`	`41`	`.ANY (AHBSRAM1)`
	`42`	`+ .ANY3 (+RW +ZI)`
`41`	`43`	`}`
`42`	`44`	`RW_IRAM4 0x40038000 0x0800 { ; RW data, CAN RAM`
`43`	`45`	`.ANY (CANRAM)`
	`46`	`+ .ANY4 (+RW +ZI)`
`44`	`47`	`}`
`45`	`48`	`}`