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misc: Allow flash image size to be constrained

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The CONFIG_FLASH_LOAD_OFFSET allows the zephyr image to be placed at
an offset from the start of flash.  This is useful for situations,
such as with a bootloader, to allow the image to not occupy the very
beginning of flash.

Complement this by adding a CONFIG_FLASH_LOAD_SIZE config, that can
constrain the size of the flash image.  With the default of zero, the
behavior is as before, with the image allowed to occupy the rest of
the flash.  It can also be defined to a non-zero value which will
constrain the image to occupy that many bytes of flash.

Although this is defined generally, it is currently only supported on
cortex-m targets.

Change-Id: I6e4a0e79c8459f931cd4757c932d20dac740f5f6
Signed-off-by: David Brown <david.brown@linaro.org>
This commit is contained in:
David Brown 2017-04-07 13:06:42 -06:00 • committed by Anas Nashif
commit fe7aa3f4fa
2 changed files with 19 additions and 2 deletions
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6
include/arch/arm/cortex_m/scripts/linker.ld
View file

@ -41,7 +41,11 @@
#endif
#define ROM_ADDR (CONFIG_FLASH_BASE_ADDRESS + CONFIG_FLASH_LOAD_OFFSET)
#define ROM_SIZE (CONFIG_FLASH_SIZE*1K - CONFIG_FLASH_LOAD_OFFSET)
#if CONFIG_FLASH_LOAD_SIZE > 0
#define ROM_SIZE CONFIG_FLASH_LOAD_SIZE
#else
#define ROM_SIZE (CONFIG_FLASH_SIZE*1K - CONFIG_FLASH_LOAD_OFFSET)
#endif
#if defined(CONFIG_XIP)
#if defined(CONFIG_IS_BOOTLOADER)

15
misc/Kconfig
View file

@ -12,7 +12,8 @@ menu "Linker Options"
config HAS_FLASH_LOAD_OFFSET
bool
help
This option is selected by targets having a FLASH_LOAD_OFFSET.
This option is selected by targets having a FLASH_LOAD_OFFSET
and FLASH_LOAD_SIZE.
config FLASH_LOAD_OFFSET
hex "Kernel load offset"
@ -26,6 +27,18 @@ config FLASH_LOAD_OFFSET
If unsure, leave at the default value 0.
config FLASH_LOAD_SIZE
hex "Kernel load size"
default 0
depends on HAS_FLASH_LOAD_OFFSET
help
If non-zero, this option specifies the size, in bytes, of the flash
area that the Zephyr image will be allowed to occupy. If zero, the
image will be able to occupy from the FLASH_LOAD_OFFSET to the end of
the device.
If unsure, leave at the default value 0.
config TEXT_SECTION_OFFSET
hex "TEXT section offset"
default 0