36 lines
1.5 KiB
Diff
36 lines
1.5 KiB
Diff
From 2cf8f6f608aa4ade16402c10751aaa7d90b994f8 Mon Sep 17 00:00:00 2001
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From: Alexander Boettcher <alexander.boettcher@genode-labs.com>
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Date: Mon, 10 Jun 2013 10:30:49 +0200
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Subject: [PATCH 09/15] Bootstrap: read out comport on x86 from BDA area
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With this patch the comport are tried to read out from the BIOS Data Area
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on x86 machines. The BDA Area are part of the first physical page and may
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contain the non-default io ports of the comport.
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When used together with 'bender' from the 'morbo' toolchain, even serial PCI
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cards (also Intel's AMT Serial Over Line adapter) are detected automatically.
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---
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l4/pkg/bootstrap/server/src/platform/x86_pc-base.h | 6 +++++-
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1 file changed, 5 insertions(+), 1 deletion(-)
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diff --git a/l4/pkg/bootstrap/server/src/platform/x86_pc-base.h b/l4/pkg/bootstrap/server/src/platform/x86_pc-base.h
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index c3e8c12f..95579c09 100644
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--- a/l4/pkg/bootstrap/server/src/platform/x86_pc-base.h
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+++ b/l4/pkg/bootstrap/server/src/platform/x86_pc-base.h
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@@ -957,7 +957,11 @@ public:
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}
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else if (comport == -1)
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{
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- legacy_uart(1, comirq, &board);
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+ /* try to read Bios Data Area (BDA) to get comport information */
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+ unsigned short comport_count = (*((unsigned short *)0x410) >> 9) & 0x7;
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+ if (comport_count) comport = *((unsigned short *)0x400), comirq, &board;
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+ else comport = 1;
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+ legacy_uart(comport, comirq, &board);
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comport = 0;
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}
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else
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--
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2.11.0
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