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soc: opentitan: update manifest format #70122

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Jun 7, 2024
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soc: opentitan: update manifest format #70122

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20 changes: 14 additions & 6 deletions soc/lowrisc/opentitan/rom_header.S
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Original file line number Diff line number Diff line change
Expand Up @@ -6,16 +6,24 @@

#include <zephyr/toolchain.h>

/* imports */
GTEXT(__start)
/* exports */
GTEXT(__rom_header)

/* OpenTitan manifest consists of 896 bytes (224 words) containing signature,
* device ID, version info, etc. The test ROM ignores all of these fields
* except for entry point (final word in manifest).
/* OpenTitan manifest consists of 1024 bytes (256 words) of manifest
* containing signature, device ID, version info, etc. The test ROM
* ignores all of these fields except for entry point.
*
* The layout below conforms to manifest version: 0x71c3 (major),
* 0x6c47 (minor). The manifest format is documented here:
* https://github.com/lowRISC/opentitan/blob/689a163294e1791bd30cfe096decf7f9233abad4/sw/host/opentitanlib/src/image/manifest.rs#L205
*/
SECTION_FUNC(rom_header, __rom_header)
.rept(223)
.rept(225)
.word 0
.endr
/* Entry point is relative to the beginning of manifest. */
.word(__start - __rom_header)
/* Extensions entry table goes here. */
.rept(30)
.word 0
.endr
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