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How much SRAM does a STM32F4 need?

Question asked by Mark Edwards on Dec 16, 2013
Latest reply on Dec 18, 2013 by Mark Edwards
This may be one of those how long is a piece of string questions, but any guidance I can get would be much appreciated.
After a fun day of trying to get my head around Scatter Files I finally found an example that gave me an example I could use.
But I am wondering how much SRAM the Microcontroller (STM32F429) actually needs, as it seems from the Datasheet that all 192K is used by 3 bit-banding regions.
Before reserving  64K the ZI data was 5K which has now increased to 70K.
I have run my program and all seems OK, so how much more could I safely use?

Here is the Scatter File Info:
LR_IROM1 0x08000000 0x00200000  {    ; load region size_region
  ER_IROM1 0x08000000 0x00200000  {  ; load address = execution address
   *.o (RESET, +First)
   .ANY (+RO)
  RW_IRAM1 0x20000000 0x00030000  {  ; RW data
   .ANY (+RW +ZI)
  Buffer1 0x20020000 EMPTY 0x00010000 {}  ; Reserved On-Chip SRAM