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gk7205v200: enable USB (UVC) webcam kernel support (fpv) (#112)

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Enable the media / V4L2 / uvcvideo kernel stack so a USB camera exposes
/dev/videoN for majestic's usbcam second-camera path.

To fit the 8M NOR (2M kernel / 5M rootfs) without dropping any sensor
library, uvcvideo and the videobuf2 framework are built INTO the kernel
(=y) instead of shipped as rootfs modules: the kernel partition had ~55 KB
of spare room while the rootfs was tight, so ~44 KB of weight moves from
rootfs to kernel. Resulting images: uImage 2022.8 KB / 2048 KB (25 KB
spare), rootfs squashfs 5080 KB / 5120 KB (40 KB spare).

GSPCA -- a separate driver for non-UVC webcams, pulled in by "default m
depends on VIDEO_V4L2" -- is disabled.

No kernel patch is carried: mmap capture works on stock uvcvideo once
majestic aligns its mmap() prototype with this MMAP_MUSL build's
uint32_t-offset shim (a userspace fix), so the earlier read()/fileio
uvcvideo patch is not needed.

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Dmitry Ilyin
2026-07-24 16:47:07 +03:00
committed by GitHub
co-authored by Claude Opus 4.8
parent 9d85e993fb
commit 6c0a45e66d
1 changed files with 25 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
devices/common/br-ext-chip-goke/board/gk7205v200/gk7205v200.generic-fpv.config
+25 -2
View File
@@ -765,7 +765,7 @@ CONFIG_REGMAP=y
CONFIG_REGMAP_I2C=y
CONFIG_REGMAP_SPI=y
CONFIG_REGMAP_MMIO=y
# CONFIG_DMA_SHARED_BUFFER is not set
CONFIG_DMA_SHARED_BUFFER=y
CONFIG_DMA_CMA=y
#
@@ -1644,7 +1644,30 @@ CONFIG_MFD_SYSCON=y
# CONFIG_MFD_WM8350_I2C is not set
# CONFIG_MFD_WM8994 is not set
# CONFIG_REGULATOR is not set
# CONFIG_MEDIA_SUPPORT is not set
#
# Multimedia support
#
CONFIG_MEDIA_SUPPORT=y
CONFIG_MEDIA_CAMERA_SUPPORT=y
# CONFIG_MEDIA_ANALOG_TV_SUPPORT is not set
# CONFIG_MEDIA_DIGITAL_TV_SUPPORT is not set
# CONFIG_MEDIA_RADIO_SUPPORT is not set
# CONFIG_MEDIA_SDR_SUPPORT is not set
# CONFIG_MEDIA_RC_SUPPORT is not set
# CONFIG_MEDIA_CONTROLLER is not set
CONFIG_VIDEO_DEV=y
CONFIG_VIDEO_V4L2=y
# CONFIG_VIDEO_ADV_DEBUG is not set
# CONFIG_VIDEO_FIXED_MINOR_RANGES is not set
CONFIG_VIDEOBUF2_CORE=y
CONFIG_VIDEOBUF2_V4L2=y
CONFIG_VIDEOBUF2_MEMOPS=y
CONFIG_VIDEOBUF2_VMALLOC=y
CONFIG_MEDIA_USB_SUPPORT=y
CONFIG_USB_VIDEO_CLASS=y
# CONFIG_USB_VIDEO_CLASS_INPUT_EVDEV is not set
# CONFIG_USB_GSPCA is not set
#
# Graphics support