Get additional 32K of RAM on nrf52. See errata #33 and #34
Project: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-larva/repo Commit: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-larva/commit/acbd147d Tree: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-larva/tree/acbd147d Diff: http://git-wip-us.apache.org/repos/asf/incubator-mynewt-larva/diff/acbd147d Branch: refs/heads/master Commit: acbd147dae0fe9f0ac90b81160042b002094ad6b Parents: 1d324a7 Author: wes3 <w...@micosa.io> Authored: Wed Dec 9 11:09:54 2015 -0800 Committer: wes3 <w...@micosa.io> Committed: Wed Dec 9 16:56:56 2015 -0800 ---------------------------------------------------------------------- hw/bsp/nrf52pdk/nrf52pdk.ld | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/incubator-mynewt-larva/blob/acbd147d/hw/bsp/nrf52pdk/nrf52pdk.ld ---------------------------------------------------------------------- diff --git a/hw/bsp/nrf52pdk/nrf52pdk.ld b/hw/bsp/nrf52pdk/nrf52pdk.ld index 8be5b6a..144ea23 100755 --- a/hw/bsp/nrf52pdk/nrf52pdk.ld +++ b/hw/bsp/nrf52pdk/nrf52pdk.ld @@ -33,10 +33,17 @@ */ OUTPUT_FORMAT ("elf32-littlearm", "elf32-bigarm", "elf32-littlearm") +/* + * NOTE: This linker script is for version 1.0 of the nrf52. See + * errata #33 and #34 on nordic infocenter website for details. This errata + * causes us to allocate a memory regision we call "CODE_RAM" so that we can + * access the full 64K RAM provided by the chip. + */ MEMORY { FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 0x80000 - RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x8000 + RAM (rwx) : ORIGIN = 0x20000000, LENGTH = 0x8000 + CODE_RAM (rwx) : ORIGIN = 0x8000000, LENGTH = 0x8000 } /* Linker script to place sections and symbol values. Should be used together @@ -168,20 +175,20 @@ SECTIONS __bss_end__ = .; } > RAM - /* Heap starts after BSS */ - __HeapBase = .; - /* .stack_dummy section doesn't contains any symbols. It is only * used for linker to calculate size of stack sections, and assign * values to stack symbols later */ .stack_dummy (COPY): { *(.stack*) - } > RAM - - /* Set stack top to end of RAM, and stack limit move down by - * size of stack_dummy section */ - __StackTop = ORIGIN(RAM) + LENGTH(RAM); + } > CODE_RAM + + /* + * Place heap and stack in CODE_RAM. Heap is at start, stack is at the + * top and stack limit is the bottom of the stack. + */ + __HeapBase = ORIGIN(CODE_RAM); + __StackTop = ORIGIN(CODE_RAM) + LENGTH(CODE_RAM); __StackLimit = __StackTop - SIZEOF(.stack_dummy); PROVIDE(__stack = __StackTop);
