hi3516cv300: kernel version independence analysis

[widgetii]

Overview

hi3516cv300 (V3, ARM926EJ-S) has full OSAL — blobs call osal_* wrappers exclusively. Zero blobs bypass OSAL for kernel APIs. This is the cleanest legacy platform alongside CV500.

PR #59 fixed the sensor_spi EXPORT_SYMBOL issue. Firmware PR #2014/#2016 wired up modules and bumped opensdk.

API Profile — Cleanest legacy platform

Direct kernel calls bypassing OSAL: NONE

No blob calls any dangerous kernel API directly.

Via OSAL (handled by recompiling OSAL source)

osal wrapper	Underlying API	Removed in	Handled by
osal_ioremap_nocache()	ioremap_nocache()	5.6	kernel_compat.h
osal_create_proc_entry()	proc_create()	3.10 (old API)	OSAL version check
osal_gettimeofday()	do_gettimeofday()	5.0	kernel_compat.h
osal_access_ok()	access_ok()	5.0 (signature)	kernel_compat.h
osal_rtc_time_to_tm()	rtc_time_to_tm()	5.6	kernel_compat.h

Kernel bump feasibility

Target	Feasible?	Shims needed
Any LTS (4.x–6.x+)	Yes	None — just recompile OSAL

CV300 can run on any kernel version that kernel_compat.h supports — same as CV500.

Comparison

Platform	OSAL?	Direct dangerous APIs	Bump ceiling
CV500	Yes	0 (strlcpy in 1 blob)	Any
CV300	Yes	0	Any
hi3519v101	Yes	2 (3 blobs)	6.6+
AV100	No	4 (13 blobs)	6.6+
CV200	No	4 (~10 blobs)	5.x–6.x
CV100	No	18 (30 blobs)	3.9

Hardware verified

• Platform: hi3516cv300 (IMX291 sensor, 128MB RAM)
• Firmware sysupgrade from official OpenIPC releases
• SDK started, 108KB JPEG snapshot captured

References

• Issue Kernel version independence: umbrella tracker for all legacy platforms #51 — umbrella tracker
• PR fix: export ssp_drv symbols from CV300 sensor_spi #59 — sensor_spi EXPORT_SYMBOL fix
• Firmware #2014 — CV300 install block
• Firmware #2016 — opensdk version bump