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sb/amd/sb700: Add sb7xx_51xx_decode_last_reset() 

The SB700 family has the ability to report the last reset
reason.  This is useful in the context of handling MCEs
and recovering from fatal errors / sync floods.

Add a function to retrieve the last reset flags.

Change-Id: I754cb25e47bd9c1e4a29ecb6cb18017d1b7c3dc4
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: https://review.coreboot.org/14263
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Timothy Pearson 2016-04-06 13:18:52 -05:00
parent c5c3d76127
commit 056e454da3
2 changed files with 13 additions and 1 deletions
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13
src/southbridge/amd/sb700/early_setup.c
View File

@ -2,7 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2010 Advanced Micro Devices, Inc.
* Copyright (C) 2015 Timothy Pearson <tpearson@raptorengineeringinc.com>, Raptor Engineering
* Copyright (C) 2015 - 2016 Raptor Engineering, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -758,6 +758,17 @@ static void sb700_por_init(void)
sb700_pmio_por_init();
}
uint16_t sb7xx_51xx_decode_last_reset(void) {
uint16_t reset_status = 0;
reset_status |= pmio_read(0x44);
reset_status |= (pmio_read(0x45) << 8);
printk(BIOS_INFO, "sb700 reset flags: %04x\n", reset_status);
if (reset_status & (0x1 << 10))
printk(BIOS_WARNING, "WARNING: Last reset was caused by fatal error / sync flood!\n");
return reset_status;
}
/*
* It should be called during early POST after memory detection and BIOS shadowing but before PCI bus enumeration.
*/

1
src/southbridge/amd/sb700/sb700.h
View File

@ -66,6 +66,7 @@ void sb7xx_51xx_enable_wideio(u8 wio_index, u16 base);
void sb7xx_51xx_disable_wideio(u8 wio_index);
void sb7xx_51xx_early_setup(void);
void sb7xx_51xx_before_pci_init(void);
uint16_t sb7xx_51xx_decode_last_reset(void);
#else
#include <device/pci.h>
/* allow override in mainboard.c */