Subversion Repositories neorv32

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== General Software Framework Setup

To allow executables to be _actually executed_ on the NEORV32 Processor the configuration of the software framework

has to be aware to the hardware configuration. This guide focuses on the memory configuration. To enabled

certain CPU ISA features refer to the <<_enabling_risc_v_cpu_extensions>> section.

[TIP]

If you have **not** changed the _default_ memory configuration in section <<_general_hardware_setup>>

you are already done and you can skip the rest of this guide.

[start=1]

. Open the NEORV32 linker script `sw/common/neorv32.ld` with a text editor. Right at the

beginning of this script you will find the `MEMORY` configuration listing the different memory section:

.Cut-out of the linker script `neorv32.ld`: `ram` memory section configuration

[source,c]

----

MEMORY

{

  ram  (rwx) : ORIGIN = 0x80000000, LENGTH = DEFINED(make_bootloader) ? 512 : 8*1024 <1>

...

----

<1> Size of the data memory address space (right-most value) (internal/external DMEM); here 8kB

[start=2]

. We only need to change the `ram` section, which presents the available data address space.

If you have changed the DMEM (_MEM_INT_DMEM_SIZE_ generic) size adapt the `LENGTH` parameter of the `ram`

section (here: `8*1024`) so it is equal to your DMEM hardware configuration.

[IMPORTANT]

Make sure you only modify the _right-most_ value (here: 8*1024)! +

The "`512`" are not relevant for the application.

[start=3]

. Done! Save your changes and close the linker script.

.Advanced: Section base address and size

[IMPORTANT]

More information can be found in the datasheet section https://stnolting.github.io/neorv32/#_address_space[Address Space].