doc: move limitions higher
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README.md
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README.md
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@ -43,6 +43,21 @@ By default, the 5V supplied by the device is forwarded to the monitor.
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To further reduce the attack surface, you can disable this by cutting the trace between the two pads marked 5V.
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To further reduce the attack surface, you can disable this by cutting the trace between the two pads marked 5V.
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The risk is that some monitors rely on this signal to detect when a device is plugged in.
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The risk is that some monitors rely on this signal to detect when a device is plugged in.
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limitations
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===========
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High-bandwidth Digital Content Protection (HDCP) is not supported since the DDC interface is limited to the EDID information.
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mode of operation
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=================
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To protect the monitor, the HDMI firewall only forwards the signal lines used for audio/video (A/V) data transfer (D0, D1, D2, CK).
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All other signal lines are unconnected (CEC, SDA, SCL, utility/HEAC+, HPD).
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This will block all non A/V interfaces (e.g. DDC, HPD, CEC, HEAC, MHL)
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The SDA/SCL lines used for the DDC interface to provide the EDID information to the device are connected to an EEPROM on the firewall.
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This is where you need to copy the monitor information to.
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This limits the DDC interface to the EDID information.
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installation
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installation
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============
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============
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@ -331,18 +346,3 @@ To verify of the data has been written correctly, read it back:
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~~~
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~~~
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sudo ./edid-rw 4 | edid-decode
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sudo ./edid-rw 4 | edid-decode
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~~~
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~~~
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limitations
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===========
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High-bandwidth Digital Content Protection (HDCP) is not supported since the DDC interface is limited to the EDID information.
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mode of operation
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=================
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To protect the monitor, the HDMI firewall only forwards the signal lines used for audio/video (A/V) data transfer (D0, D1, D2, CK).
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All other signal lines are unconnected (CEC, SDA, SCL, utility/HEAC+, HPD).
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This will block all non A/V interfaces (e.g. DDC, HPD, CEC, HEAC, MHL)
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The SDA/SCL lines used for the DDC interface to provide the EDID information to the device are connected to an EEPROM on the firewall.
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This is where you need to copy the monitor information to.
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This limits the DDC interface to the EDID information.
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