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arch/avr: decouple enabling of IOBJ/IPTR qualifiers from debugging

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These qualifiers are useful on their own, not only when debugging-related
strings are flagged with them
This commit is contained in:
Kerogit 2025-03-24 22:53:01 +01:00 • committed by Xiang Xiao
parent 22df1ed2ab
commit 3b39101c82
1 changed files with 22 additions and 12 deletions
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34
arch/avr/src/avr/Kconfig
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@ -57,22 +57,32 @@ config AVR_BUILDROOT_TOOLCHAIN
endchoice # Toolchain
menu "Atmel AVR Toolchain options"
depends on AVR_ATMEL_AVR_TOOLCHAIN
config AVR_HAS_MEMX_PTR
bool "Enable in-flash static const strings"
depends on AVR_ATMEL_AVR_TOOLCHAIN
depends on ARCH_DEBUG_H
default y
depends on AVR_ATMEL_AVR_TOOLCHAIN || AVR_LINUXGCC_TOOLCHAIN
default y if ARCH_DEBUG_H
default n
---help---
Enabling this option (recommended) will place all constant
strings used for debugging and assertion in program memory
and allow the corresponding routines to get the strings
directly from there. This will dramatically decrease amount
of RAM needed to hold this static data.
Enabling this option activates IOBJ and IPTR qualifiers
for pointers in the source code. Compiler will then be allowed
to place constants into program memory without copying it to RAM,
reducing amount of RAM needed to hold static data.
The compiler then extends pointers with these qualifiers enabled
to 24bit length with highest bit set for data that reside in RAM.
Based on this bit, it will then read the data using instructions
appropriate for the underlying storage. As such, there is
a performance tradeoff.
Additionally, if this is enabled, all constant strings used
for debugging and assertion are placed into program memory,
corresponding routines are then able to get them directly
from there.
Note that this doesn't allow the application to use program memory
pointers in arbitrary interaction with the kernel. Not all API
functions have these qualifiers added to their parameters.
endmenu # Atmel AVR Toolchain options
config AVR_HAS_RAMPZ
bool