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# kgpe: platform-specific notes
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## quirks
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### hang during boot if vga enabled
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If the system hangs on startup before attempting to boot the
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ownerboot Linux kernel, and the last few messages you see on the
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console look like the following, try disabling the on-board VGA
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output (move jumper `VGA_SW1` to the two pins closest to the pci
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slots):
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```
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...
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PCI: 00:14.1 10 <- [0x0000003030 - 0x0000003037] size 0x00000008 gran 0x03 io
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PCI: 00:14.1 14 <- [0x0000003048 - 0x000000304b] size 0x00000004 gran 0x02 io
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PCI: 00:14.1 18 <- [0x0000003038 - 0x000000303f] size 0x00000008 gran 0x03 io
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PCI: 00:14.1 1c <- [0x000000304c - 0x000000304f] size 0x00000004 gran 0x02 io
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PCI: 00:14.1 20 <- [0x0000003010 - 0x000000301f] size 0x00000010 gran 0x04 io
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PCI: 00:14.2 10 <- [0x00f0404000 - 0x00f0407fff] size 0x00004000 gran 0x0e mem64
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PCI: 00:14.3 a0 <- [0x00f0410000 - 0x00f0410000] size 0x00000001 gran 0x00 mem
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```
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## watchdogs
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The KGPE-D16 has *at least* three separate hardware watchdogs!
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- One in the SB700 southbridge, although it appears to be disabled
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(Linux's `sp5100_tco` reports that it cannot be enabled).
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- One in the W83795 hardware monitor (thermal/fan control chip)
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- One in the W83667HG-A SuperIO chip
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I've found the third one to be most reliable. The Linux
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`w83627hf_wdt` kernel module for this watchdog works correctly, and
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I was able to write a coreboot patch (to be included with ownerboot)
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to start the watchdog extremely early in the boot process -- before
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DRAM initialization or PNP enumeration. This is extremely helpful
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with unattended servers, where a hang in the boot process requires
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manual power-cycling.
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