mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-21 23:26:52 +02:00
Kevin Thomas
34 lines
1.6 KiB
ArmAsm
34 lines
1.6 KiB
ArmAsm
/**
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* FILE: image_def.s
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*
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* DESCRIPTION:
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* RP2350 IMAGE_DEF Block.
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*
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* BRIEF:
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* A minimum amount of metadata (a valid IMAGE_DEF block) must be embedded in any
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* binary for the bootrom to recognise it as a valid program image, as opposed to,
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* for example, blank flash contents or a disconnected flash device. This must
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* appear within the first 4 kB of a flash image, or anywhere in a RAM or OTP image.
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* Unlike RP2040, there is no requirement for flash binaries to have a checksummed
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* "boot2" flash setup function at flash address 0. The RP2350 bootrom performs a
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* simple best‑effort XIP setup during flash scanning, and a flash‑resident program
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* can continue executing in this state, or can choose to reconfigure the QSPI
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* interface at a later time for best performance.
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*
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* AUTHOR: Kevin Thomas
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* CREATION DATE: October 5, 2025
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* UPDATE DATE: October 5, 2025
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*/
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.section .picobin_block, "a" // place IMAGE_DEF block in flash
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.word 0xffffded3 // PICOBIN_BLOCK_MARKER_START
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.byte 0x42 // PICOBIN_BLOCK_ITEM_1BS_IMAGE_TYPE
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.byte 0x1 // item is 1 word in size
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.hword 0b0001000000100001 // SECURE mode (0x1021)
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.byte 0xff // PICOBIN_BLOCK_ITEM_2BS_LAST
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.hword 0x0001 // item is 1 word in size
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.byte 0x0 // pad
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.word 0x0 // relative pointer to next block (0 = loop to self)
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.word 0xab123579 // PICOBIN_BLOCK_MARKER_END
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