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| -rw-r--r-- | Documentation/tutorial/flashing_firmware/ext_standalone.md | 40 | ||||
| -rw-r--r-- | Documentation/tutorial/flashing_firmware/hp_spi_header.svg | 109 | ||||
| -rw-r--r-- | Documentation/tutorial/flashing_firmware/hp_spi_header_mb.jpg | bin | 0 -> 21906 bytes |
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diff --git a/Documentation/tutorial/flashing_firmware/ext_standalone.md b/Documentation/tutorial/flashing_firmware/ext_standalone.md index 3a676ce47c..1cb03e1cc1 100644 --- a/Documentation/tutorial/flashing_firmware/ext_standalone.md +++ b/Documentation/tutorial/flashing_firmware/ext_standalone.md @@ -19,5 +19,45 @@ It is possible to set the onboard flash on hold and use another flash chip. Connect all lines one-to-one, except /HOLD. Pull /HOLD of the soldered flash IC low, and /HOLD of your replacement flash IC high. +### SPI header +Some boards feature a pin header which is connected to the SPI bus. This can +also be used to connect a secondary flash chip. + +#### HP boards +Many HP desktop mainboards have a 2x8 or 2x10 block of header pins which +can be used to connect a second flash chip. One pin is connected to the +onboard flash's /CS pin, and another is connected to the chipset's /CS +pin. Normally a jumper cap is placed between these pins, allowing the +chipset to access the onboard flash. To use this header, remove this +jumper and connect all lines except /CS one-to-one with the +corresponding pin on the header. The secondary flash chip's /CS line +should be connected to the chipset /CS pin on the header. By doing this +the secondary SPI flash, rather than the onboard flash, will respond to +accesses from the chipset. + +![][hp_spi_header_pinout] + +![][hp_spi_header_mainboard] + +Note that on boards where this header is unpopulated, a jumper resistor +will be populated nearby which serves the purpose of the jumper cap. One +end should have continuity with the /CS pin on the flash, and the other +end should have continuity with the chipset /CS pin on the unpopulated +header. It may also be possible to find this resistor through visual +inspection of the traces on the /CS pins. This resistor should be +desoldered if you wish to solder a pin header to the board and connect a +secondary flash, otherwise the onboard flash will always respond to +accesses. + +#### Other boards +Other boards may have similar headers, but will likely use a different +pinout than the ones explicitly mentioned here. Usually such a header +will be located near the onboard SPI flash. If schematics are available, +the pinout for the header will likely be found in it, but it could also +be determined using a multimeter in continuity mode to map out the +connections between the SPI flash and the header. + [EM100Pro]: https://www.dediprog.com/product/EM100Pro +[hp_spi_header_pinout]: hp_spi_header.svg +[hp_spi_header_mainboard]: hp_spi_header_mb.jpg diff --git a/Documentation/tutorial/flashing_firmware/hp_spi_header.svg b/Documentation/tutorial/flashing_firmware/hp_spi_header.svg new file mode 100644 index 0000000000..c29a444604 --- /dev/null +++ b/Documentation/tutorial/flashing_firmware/hp_spi_header.svg @@ -0,0 +1,109 @@ +<?xml version="1.0" encoding="UTF-8" standalone="no"?> + +<svg + width="40.266247mm" + height="20.267391mm" + viewBox="0 0 40.266247 20.267391" + version="1.1" + id="svg5" + xmlns="http://www.w3.org/2000/svg" + xmlns:svg="http://www.w3.org/2000/svg"> + <defs + id="defs2" /> + <g + id="layer1" + transform="translate(0.1322915,0.1322915)"> + <path + style="fill:none;stroke:#000000;stroke-width:0.264583" + d="M 0,0 C 0,6.6676027 0,13.335205 0,20.002808" + id="path500" /> + <path + style="fill:none;stroke:#000000;stroke-width:0.264583" + d="m 0,20.002808 c 13.333889,0 26.667777,0 40.001666,0 0,-6.667603 0,-13.3352053 0,-20.002808 -6.665673,0 -13.331347,0 -19.99702,0 0,6.6676027 0,13.335205 0,20.002808" + id="path506" /> + <path + style="fill:none;stroke:#000000;stroke-width:0.264583" + d="m 0,0 c 3.3327445,0 6.6654889,0 9.9982334,0 0,6.6676027 0,13.335205 0,20.002808" + id="path508" /> + <path + style="fill:none;stroke:#000000;stroke-width:0.264583" + d="m 0,10.001404 c 13.333889,0 26.667777,0 40.001666,0" + id="path510" /> + <path + style="fill:none;stroke:#000000;stroke-width:0.264583" + d="m 30.003154,0 c 0,6.6676027 0,13.335205 0,20.002808" + id="path512" /> + <text + xml:space="preserve" + font-size="2.82222px" + style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:normal" + x="22.156124" + y="6.3107877" + id="text676"><tspan + x="22.156124" + y="6.3107877">VCC</tspan></text> + <text + xml:space="preserve" + font-size="2.82222px" + style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:normal" + x="31.972855" + y="6.3107877" + id="text730"><tspan + id="tspan728" + x="31.972855" + y="6.3107877">GND</tspan></text> + <text + xml:space="preserve" + font-size="2.82222px" + style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:normal" + x="32.398666" + y="16.285427" + id="text734"><tspan + id="tspan732" + x="32.398666" + y="16.285427">CLK</tspan></text> + <text + xml:space="preserve" + font-size="2.82222px" + style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:normal" + x="22.770041" + y="16.285427" + id="text738"><tspan + id="tspan736" + x="22.770041" + y="16.285427">DO</tspan></text> + <text + xml:space="preserve" + font-size="2.82222px" + style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:normal" + x="13.605446" + y="16.286804" + id="text742"><tspan + id="tspan740" + x="13.605446" + y="16.286804">DI</tspan></text> + <text + xml:space="preserve" + font-size="2.82222px" + style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:normal" + x="2.5204566" + y="6.1998558" + id="text746"><tspan + id="tspan744" + x="2.5204566" + y="6.1998558">/CS</tspan></text> + <text + xml:space="preserve" + font-size="2.5px" + style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:normal" + x="5.0321894" + y="14.500522" + id="text750"><tspan + id="tspan748" + x="5.0321894" + y="14.500522">/CS</tspan><tspan + x="5.0321894" + y="17.146358" + id="tspan752">chipset</tspan></text> + </g> +</svg> diff --git a/Documentation/tutorial/flashing_firmware/hp_spi_header_mb.jpg b/Documentation/tutorial/flashing_firmware/hp_spi_header_mb.jpg Binary files differnew file mode 100644 index 0000000000..b9edd734b8 --- /dev/null +++ b/Documentation/tutorial/flashing_firmware/hp_spi_header_mb.jpg |
