SeaBIOS June 2018

seabios@seabios.org

12 participants
22 discussions

CHS translation (BIOS incompatibility)
by Nikolay Ivanets 02 Jun '18

02 Jun '18

Hello. I have a bootable disk image taken from physical machine. Original BIOS is unknown. Operating system installed is Windows 2003 R2. I'm trying to boot it with Qemu and Seabios and get "Error loading operating system". After investigation I found: - image contains MBR partition table and single NTFS partition - partition starts at CHS (0,1,1) and absolute offset is 0x20 (32 sectors) Debugging MBR bootstrap code I found it makes several INT13 calls to BIOS: AH=08, AH=02 to get disk parameters and load first partition sector. It appeared BIOS returns CHS as (x,y,63) and thus MBR bootstrap loads 63rd sector instead 32nd and "Error loading operating system" happens. It seems well-known BIOS incompatibility issue. Is there any way to workaround this in Seabios? I would appreciate for any tips. -- Mykola Ivanets

1 0

[PATCH 0/6] qemu: add bochs-display support
by Gerd Hoffmann 01 Jun '18

01 Jun '18

Add support for the new bochs-display device in qemu. Gerd Hoffmann (6): pci,optionrom: enable non-vga display devices cbvga: factor out cbvga_setup_modes() qemu: add bochs-display support cbvga_setup_modes: use real mode number instead of 0x140 cbvga_list_modes: don't list current mode twice [workaround] cbvga_set_mode: disable clearmem vgasrc/vgahw.h | 28 ++++++------ vgasrc/vgautil.h | 1 + src/fw/pciinit.c | 15 +++++-- src/optionroms.c | 29 ++++++++++++- vgasrc/cbvga.c | 127 +++++++++++++++++++++++++++++++++++++++++++------------ vgasrc/Kconfig | 17 ++++++++ 6 files changed, 173 insertions(+), 44 deletions(-) -- 2.9.3

2 15

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

SeaBIOS June 2018