D14341.id40860.diff
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	Index: head/stand/i386/libi386/biosdisk.c
	===================================================================
	--- head/stand/i386/libi386/biosdisk.c
	+++ head/stand/i386/libi386/biosdisk.c
	@@ -122,6 +122,8 @@

	#define BD(dev) (bdinfo[(dev)->dd.d_unit])

	+static void bd_io_workaround(struct disk_devdesc *dev);
	+
	static int bd_read(struct disk_devdesc *dev, daddr_t dblk, int blks,
	caddr_t dest);
	static int bd_write(struct disk_devdesc *dev, daddr_t dblk, int blks,
	@@ -724,6 +726,15 @@
	return (0);
	}

	+static void
	+bd_io_workaround(struct disk_devdesc *dev)
	+{
	+ uint8_t buf[8 * 1024];
	+
	+ bd_edd_io(dev, 0xffffffff, 1, (caddr_t)buf, 0);
	+}
	+
	+
	static int
	bd_io(struct disk_devdesc *dev, daddr_t dblk, int blks, caddr_t dest, int write)
	{
	@@ -736,6 +747,17 @@

	resid = blks;
	p = dest;
	+
	+ /*
	+ * Workaround for a problem with some HP ProLiant BIOS failing to work out
	+ * the boot disk after installation. hrs and kuriyama discovered this
	+ * problem with an HP ProLiant DL320e Gen 8 with a 3TB HDD, and discovered
	+ * that an int13h call seems to cause a buffer overrun in the bios. The
	+ * problem is alleviated by doing an extra read before the buggy read. It
	+ * is not immediately known whether other models are similarly affected.
	+ */
	+ if (dblk >= 0x100000000)
	+ bd_io_workaround(dev);

	/* Decide whether we have to bounce */
	if (VTOP(dest) >> 20 != 0 \|\| (BD(dev).bd_unit < 0x80 &&