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- Improve help texts for option ROM initialization methods 

- disallow REAL_MODE method if ARCH_X86 is not set.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>
Acked-by: Stefan Reinauer <stepan@coresystems.de>



git-svn-id: svn://svn.coreboot.org/coreboot/trunk@5072 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
This commit is contained in:
Stefan Reinauer 2010-01-31 21:46:12 +00:00 committed by Stefan Reinauer
parent 15b0354107
commit 14be4d0d52
1 changed files with 29 additions and 11 deletions
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40
src/devices/Kconfig
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@ -42,32 +42,50 @@ config PCI_ROM_RUN
Examples include IDE/SATA controller option ROMs and option ROMs
for network cards (NICs).
# TODO: Describe YABEL vs. x86emu differences in more detail.
choice
prompt "Option ROM execution type"
default PCI_OPTION_ROM_RUN_REALMODE
default PCI_OPTION_ROM_RUN_YABEL if !ARCH_X86
default PCI_OPTION_ROM_RUN_REALMODE if ARCH_X86
depends on PCI_ROM_RUN || VGA_ROM_RUN
config PCI_OPTION_ROM_RUN_REALMODE
prompt "Real mode"
bool
depends on ARCH_X86
help
If you select this option, PCI option ROMs will be executed
natively on the hardware (a 32bit x86 system is required).
config PCI_OPTION_ROM_RUN_YABEL
prompt "YABEL"
bool
help
If you select this option, the YABEL BIOS emulator will be used to
execute PCI option ROMs.
natively on the CPU in real mode. No CPU emulation is involved,
so this is the fastest, but also the least secure option.
(only works on x86/x64 systems)
config PCI_OPTION_ROM_RUN_X86EMU
prompt "x86emu"
bool
help
If you select this option, the x86emu BIOS emulator will be used to
If you select this option, the x86emu CPU emulator will be used to
execute PCI option ROMs.
When choosing this option, x86emu will pass through all hardware
accesses to memory and IO devices to the underlying memory and IO
addresses. While this option prevents option ROMs from doing dirty
tricks with the CPU (such as installing SMM modules or hypervisors),
they can still access all devices in the system.
Choosing x86emu, option ROM execution is slower than native execution
in real mode, but faster than the full system emulation YABEL
This is the default choice for non-x86 systems.
config PCI_OPTION_ROM_RUN_YABEL
prompt "YABEL"
bool
help
If you select this option, the YABEL system emulator will be used to
execute PCI option ROMs.
YABEL consists of two parts: It uses x86emu for the CPU emulation and
additionally provides a PC system emulation that filters bad device and
memory access (such as PCI config space access to other devices than the
initialized one).
This option best prevents option ROMs from doing dirty tricks with the
system (such as installing SMM modules or hypervisors), but it is also
significantly slower than the other option ROM initialization methods.
endchoice