doc/mb/upsquared: Add documentation

This patch adds documentation about the UP² mainboard
and the IFWI used by Apollolake platform.

Change-Id: Ic708ddbd2616eee4e5ec2740b3eac18b408bde38
Signed-off-by: Felix Singer <felix.singer@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32935
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>

1 files changed, 126 insertions, 0 deletions

diff --git a/Documentation/mainboard/up/squared/header_40pin_gpio_uart1.svg b/Documentation/mainboard/up/squared/header_40pin_gpio_uart1.svg
new file mode 100644
index 0000000000..16f6397de4
--- /dev/null
+++ b/Documentation/mainboard/up/squared/header_40pin_gpio_uart1.svg
@@ -0,0 +1,126 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.0//EN" "http://www.w3.org/TR/2001/PR-SVG-20010719/DTD/svg10.dtd">
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+  <text font-size="12.8" style="fill: #000000;text-anchor:start;font-family:sans-serif;font-style:normal;font-weight:700" x="460" y="-20">
+    <tspan x="460" y="-20">40 pin GPIO header</tspan>
+  </text>
+  <text font-size="12.8" style="fill: #000000;text-anchor:middle;font-family:sans-serif;font-style:normal;font-weight:700" x="520" y="-175.575">
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+    <tspan x="560" y="-203.575">UART1</tspan>
+    <tspan x="560" y="-187.575">TX</tspan>
+  </text>
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+    <tspan x="600" y="-183.575">UART1</tspan>
+    <tspan x="600" y="-167.575">RX</tspan>
+  </text>
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