37 lines
1.1 KiB
Diff
37 lines
1.1 KiB
Diff
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From 674002256247a01f4969a3795a5aceca68792a55 Mon Sep 17 00:00:00 2001
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From: Riku Viitanen <riku.viitanen@protonmail.com>
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Date: Fri, 21 Apr 2023 21:41:07 +0300
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Subject: [PATCH] at_keyboard.c: add timeout to fix hang on hp elitebooks
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This fixes GRUB on Coreboot on HP EliteBooks by implementing
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a 200ms timeout. GRUB used to hang. see: https://ticket.coreboot.org/issues/141
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---
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grub-core/term/at_keyboard.c | 11 ++++++++++-
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1 file changed, 10 insertions(+), 1 deletion(-)
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diff --git a/grub-core/term/at_keyboard.c b/grub-core/term/at_keyboard.c
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index 597111077..28d1d0a77 100644
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--- a/grub-core/term/at_keyboard.c
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+++ b/grub-core/term/at_keyboard.c
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@@ -42,7 +42,16 @@ keyboard_controller_wait_until_ready (void)
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{
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/* 50 us would be enough but our current time resolution is 1ms. */
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grub_millisleep (1);
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- while (! KEYBOARD_COMMAND_ISREADY (grub_inb (KEYBOARD_REG_STATUS)));
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+
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+ unsigned i = 200;
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+ while (! KEYBOARD_COMMAND_ISREADY (grub_inb (KEYBOARD_REG_STATUS))) {
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+ grub_millisleep (1);
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+
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+ /* Timeout */
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+ if (! i--) {
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+ break;
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+ }
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+ }
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}
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static grub_uint8_t
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--
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2.40.0
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