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