scratch section define in zephyr sysflash.h inappropriate

[Cherish-forever]

In file zephyr/include/sysflash.h line 42:

#if !defined(CONFIG_BOOT_SWAP_USING_MOVE) #define FLASH_AREA_IMAGE_SCRATCH FLASH_AREA_ID(image_scratch) #endif

that means:
CONFIG_BOOT_DIRECT_XIP=y or CONFIG_BOOT_UPGRADE_ONLY=y or CONFIG_BOOT_BOOTSTRAP=y
all those config must have scratch, I think CONFIG_BOOT_UPGRADE_ONLY and CONFIG_BOOT_DIRECT_XIP no need scratch section.

[d3zd3z]

This suggests we always test with a partition table containing scratch (which makes a little bit of sense, since the test configurations can then also cover the situations with scratch.

This makes sense to test in the simulator.

[utzig]

This issue was also seen on #1004.

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