Renesas R-Car V4H (r8a779g0) has PCIe controller, and it requires specific firmwre downloading. So, add a document about the firmware how to get. Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> --- Krzysztof-san suggests writing a document about this [1]. So, I submit this patch. [1] https://lore.kernel.org/linux-pci/20240701204333.GB412915@rocinante/ .../admin-guide/rcar-pcie-firmware.rst | 20 +++++++++++++++++++ 1 file changed, 20 insertions(+) create mode 100644 Documentation/admin-guide/rcar-pcie-firmware.rst diff --git a/Documentation/admin-guide/rcar-pcie-firmware.rst b/Documentation/admin-guide/rcar-pcie-firmware.rst new file mode 100644 index 000000000000..75c0d086dcc5 --- /dev/null +++ b/Documentation/admin-guide/rcar-pcie-firmware.rst @@ -0,0 +1,20 @@ +Firmware of PCIe controller for Renesas R-Car V4H +================================================= + +Renesas R-Car V4H (r8a779g0) has PCIe controller, and it requires specific +firmwre downloading. The firmware file "104_PCIe_fw_addr_data_ver1.05.txt" +is available in the datasheet as a text file. But, Renesas is not able to +distribute the firmware freely. So, we require converting the text file to +a binary before the driver runs by using the following script: + +.. code-block:: sh + + $ awk '/^\s*0x[0-9A-Fa-f]{4}\s+0x[0-9A-Fa-f]{4}/ \ + { print substr($2,5,2) substr($2,3,2) }' \ + 104_PCIe_fw_addr_data_ver1.05.txt | xxd -p -r > \ + rcar_gen4_pcie.bin + + $ sha1sum rcar_gen4_pcie.bin + + # Example output of the sha1sum: + 1d0bd4b189b4eb009f5d564b1f93a79112994945 rcar_gen4_pcie.bin -- 2.25.1
