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nrf: expose the RAM base address

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The RAM base address is needed during SoftDevice initialization. So far,
the same magic value has been used in aykevl/go-bluetooth and in TinyGo,
but this should be configured in only one place.

This will have additional benefits in the future:

  * It is currently set to 0x39c0, which is around 14.5kB. Most nrf51822
    chips have only 16kB of RAM, so this is way too much for those
    chips.
  * LLD in LLVM 11 allows expressions in the MEMORY part of linker
    scripts, which will allow overriding the SoftDevice RAM area with a
    linker flag, which might come in handy.
This commit is contained in:
Ayke van Laethem
2020-05-24 19:33:50 +02:00
committed by Ron Evans
parent 9f4459cee1
commit e69131c0d3
2 changed files with 6 additions and 0 deletions
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targets/nrf52-s132v6.ld
+3
View File
@@ -7,4 +7,7 @@ MEMORY
_stack_size = 4K;
/* This value is needed by the Nordic SoftDevice. */
__app_ram_base = ORIGIN(RAM);
INCLUDE "targets/arm.ld"
targets/nrf52840-s140v7.ld
+3
View File
@@ -7,4 +7,7 @@ MEMORY
_stack_size = 4K;
/* This value is needed by the Nordic SoftDevice. */
__app_ram_base = ORIGIN(RAM);
INCLUDE "targets/arm.ld"