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Mac Webcam (NOT WORK)

  1. Macbook pro 內建 webcam 無驅動程式，網路有相關程式，必須下載編譯。 
    [root@dywmac src]# git clone https://github.com/patjak/bcwc_pcie/
  2. 安裝核心發展套件。 
    [root@dywmac src]# rpm -ivh http://dy.csie.cyut.edu.tw/kernel/ltml/RPMS/\
kernel-ml-devel-4.3.3-1.el6.elrepo.x86_64.rpm
  3. 以此核心版本編譯，雖完成編譯，但有警告訊息，且開機載入不成功。 
    [root@dywmac src]# cd /usr/src/bcwc_pcie
[root@dywmac bcwc_pcie]# make
make -C /lib/modules/4.3.3-1.el6.elrepo.x86_64/build M=/usr/src/bcwc_pcie modules
make[1]: Entering directory `/usr/src/kernels/4.3.3-1.el6.elrepo.x86_64'
  CC [M]  /usr/src/bcwc_pcie/fthd_ddr.o
  CC [M]  /usr/src/bcwc_pcie/fthd_hw.o
  CC [M]  /usr/src/bcwc_pcie/fthd_drv.o
  CC [M]  /usr/src/bcwc_pcie/fthd_ringbuf.o
  CC [M]  /usr/src/bcwc_pcie/fthd_isp.o
/usr/src/bcwc_pcie/fthd_isp.c: In function ‘fthd_isp_cmd_channel_camera_config’:
/usr/src/bcwc_pcie/fthd_isp.c:662:2: warning: ‘ret’ may be used uninitialized
 in this function [-Wmaybe-uninitialized]
  return ret;
  ^
  CC [M]  /usr/src/bcwc_pcie/fthd_v4l2.o
/usr/src/bcwc_pcie/fthd_v4l2.c:298:2: warning: initialization from
 incompatible pointer type [enabled by default]
  .queue_setup            = fthd_buffer_queue_setup,
  ^
/usr/src/bcwc_pcie/fthd_v4l2.c:298:2: warning: (near initialization
 for ‘vb2_queue_ops.queue_setup’) [enabled by default]
  CC [M]  /usr/src/bcwc_pcie/fthd_buffer.o
  CC [M]  /usr/src/bcwc_pcie/fthd_debugfs.o
  LD [M]  /usr/src/bcwc_pcie/facetimehd.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "__fentry__" [/usr/src/bcwc_pcie/facetimehd.ko] undefined!
  CC      /usr/src/bcwc_pcie/facetimehd.mod.o
  LD [M]  /usr/src/bcwc_pcie/facetimehd.ko
make[1]: Leaving directory `/usr/src/kernels/4.3.3-1.el6.elrepo.x86_64'
  4. 安裝 4.4.5-1 版核心發展套件。 
    [root@dywmac RPMS]# rpm -ivh kernel-ml-devel-4.4.5-1.el6.elrepo.x86_64.rpm
  5. 編譯 facetimehd。 
    [root@dywmac RPMS]# cd /usr/src/bcwc_pcie/
[root@dywmac bcwc_pcie]# make
make -C /lib/modules/4.4.5-1.el6.elrepo.x86_64/build M=/usr/src/bcwc_pcie modules
make[1]: Entering directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  CC [M]  /usr/src/bcwc_pcie/fthd_ddr.o
  CC [M]  /usr/src/bcwc_pcie/fthd_hw.o
  CC [M]  /usr/src/bcwc_pcie/fthd_drv.o
  CC [M]  /usr/src/bcwc_pcie/fthd_ringbuf.o
  CC [M]  /usr/src/bcwc_pcie/fthd_isp.o
/usr/src/bcwc_pcie/fthd_isp.c: In function ‘fthd_isp_cmd_channel_camera_config’:
/usr/src/bcwc_pcie/fthd_isp.c:662:2: warning: ‘ret’ may be used uninitialized
 in this function [-Wmaybe-uninitialized]
  return ret;
  ^
  CC [M]  /usr/src/bcwc_pcie/fthd_v4l2.o
  CC [M]  /usr/src/bcwc_pcie/fthd_buffer.o
  CC [M]  /usr/src/bcwc_pcie/fthd_debugfs.o
  LD [M]  /usr/src/bcwc_pcie/facetimehd.o
  Building modules, stage 2.
  MODPOST 1 modules
WARNING: "__fentry__" [/usr/src/bcwc_pcie/facetimehd.ko] undefined!
  CC      /usr/src/bcwc_pcie/facetimehd.mod.o
  LD [M]  /usr/src/bcwc_pcie/facetimehd.ko
make[1]: Leaving directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  6. 安裝 facetimehd 模組。 
    [root@dywmac bcwc_pcie]# make install
make -C /lib/modules/4.4.5-1.el6.elrepo.x86_64/build M=/usr/src/bcwc_pcie modules_install
make[1]: Entering directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  INSTALL /usr/src/bcwc_pcie/facetimehd.ko
  DEPMOD  4.4.5-1.el6.elrepo.x86_64
WARNING: /lib/modules/4.4.5-1.el6.elrepo.x86_64/extra/facetimehd.ko needs unknown symbol __fentry__
make[1]: Leaving directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  7. 無法載入 facetimehd 模組。 
    [root@dywmac bcwc_pcie]# modprobe facetimehd
FATAL: Error inserting facetimehd (/lib/modules/4.4.5-1.el6.elrepo.x86_64/extra/facetimehd.ko):
 Unknown symbol in module, or unknown parameter (see dmesg)
  8. 目前 gcc 版本 4.8，版本不對，降低版本至 4.4。 
    [root@dywmac bcwc_pcie]# yum downgrade gcc-* libstdc++* cpp libgomp
  9. 再編譯已無 __fentry__ 相關的錯誤訊息。 
    [root@dywmac bcwc_pcie]# make
make -C /lib/modules/4.4.5-1.el6.elrepo.x86_64/build M=/usr/src/bcwc_pcie modules
make[1]: Entering directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  CC [M]  /usr/src/bcwc_pcie/fthd_ddr.o
  CC [M]  /usr/src/bcwc_pcie/fthd_hw.o
  CC [M]  /usr/src/bcwc_pcie/fthd_drv.o
  CC [M]  /usr/src/bcwc_pcie/fthd_ringbuf.o
  CC [M]  /usr/src/bcwc_pcie/fthd_isp.o
/usr/src/bcwc_pcie/fthd_isp.c: In function ‘fthd_isp_cmd_channel_camera_config’:
/usr/src/bcwc_pcie/fthd_isp.c:647: warning: ‘ret’ may be used uninitialized in this function
  CC [M]  /usr/src/bcwc_pcie/fthd_v4l2.o
  CC [M]  /usr/src/bcwc_pcie/fthd_buffer.o
  CC [M]  /usr/src/bcwc_pcie/fthd_debugfs.o
  LD [M]  /usr/src/bcwc_pcie/facetimehd.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /usr/src/bcwc_pcie/facetimehd.mod.o
  LD [M]  /usr/src/bcwc_pcie/facetimehd.ko
make[1]: Leaving directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  10. 安裝 facetimehd 模組。 
    [root@dywmac bcwc_pcie]# make install
make -C /lib/modules/4.4.5-1.el6.elrepo.x86_64/build M=/usr/src/bcwc_pcie modules_install
make[1]: Entering directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  INSTALL /usr/src/bcwc_pcie/facetimehd.ko
  DEPMOD  4.4.5-1.el6.elrepo.x86_64
make[1]: Leaving directory `/usr/src/kernels/4.4.5-1.el6.elrepo.x86_64'
  11. 成功載入 facetimehd 模組。 
    [root@dywmac bcwc_pcie]# modprobe facetimehd
[root@dywmac bcwc_pcie]# lsmod | grep facetimehd
facetimehd             69632  0 
videobuf2_v4l2         28672  2 uvcvideo,facetimehd
videobuf2_dma_sg       20480  1 facetimehd
videobuf2_core         36864  3 uvcvideo,facetimehd,videobuf2_v4l2
videodev              180224  5 uvcvideo,facetimehd,videobuf2_v4l2,v4l2_common,videobuf2_core
  12. 但還是沒有 webcam，查詢 log 發現沒有 firmware.bin。 
    [root@dywmac ~]# tail /var/log/messages 
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: VDL set to: coarse=0x10008, fine=0x1011a
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Virtual VTT enabled
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: S2 DRAM memory address: 0x22159559
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Rewrite DDR mode registers succeeded
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Full memory verification succeeded! (0)
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Direct firmware load for facetimehd/firmware.bin failed with error -2
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Falling back to user helper
Sep 21 08:52:18 localhost kernel: facetimehd: probe of 0000:02:00.0 failed with error -11
Sep 21 08:52:18 localhost firmware.sh[3287]: Cannot find  firmware file 'facetimehd/firmware.bin'
Sep 21 08:52:19 localhost pulseaudio[2965]: ratelimit.c: 28 events suppressed
  13. 但還是沒有 webcam，查詢 log 發現沒有 firmware.bin。 
    [root@dywmac ~]# tail /var/log/messages 
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: VDL set to: coarse=0x10008, fine=0x1011a
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Virtual VTT enabled
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: S2 DRAM memory address: 0x22159559
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Rewrite DDR mode registers succeeded
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Full memory verification succeeded! (0)
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Direct firmware load for facetimehd/firmware.bin failed with error -2
Sep 21 08:52:18 localhost kernel: facetimehd 0000:02:00.0: Falling back to user helper
Sep 21 08:52:18 localhost kernel: facetimehd: probe of 0000:02:00.0 failed with error -11
Sep 21 08:52:18 localhost firmware.sh[3287]: Cannot find  firmware file 'facetimehd/firmware.bin'
Sep 21 08:52:19 localhost pulseaudio[2965]: ratelimit.c: 28 events suppressed
  14. 進入原始碼目錄 /usr/src/bcwc_pcie/firmware，執行 make 進行編譯，出現錯誤。 
    [root@dywmac ~]# cd /usr/src/bcwc_pcie/firmware/
[root@dywmac firmware]# make

Checking dependencies for driver download...
/usr/bin/curl
/usr/bin/xzcat
/bin/cpio

Downloading the driver, please wait...
mv: cannot stat `System/Library/Extensions/AppleCameraInterface.kext
/Contents/MacOS/AppleCameraInterface': No such file or directory
make: *** [AppleCameraInterface] Error 1
  15. 原因為 Makefile 中下載檔案出問題。 
    [root@dywmac firmware]#  curl -s -L -r "187085540-191012220" \
"https://support.apple.com/downloads/DL1858/en_US/osxupd10.11.3.dmg" \
| xzcat -q | cpio --format odc -i -d \
"./System/Library/Extensions/AppleCameraInterface.kext/Contents/MacOS/AppleCameraInterface"
xzcat: (stdin): Unexpected end of input
cpio: premature end of file