Features/PC System Flash: Difference between revisions
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-pflash parameter will be loaded as flash image just below the bios rom image. | -pflash parameter will be loaded as flash image just below the bios rom image. | ||
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=Known Issues= | |||
* KVM will not boot if -pflash is used and -bios is not used. KVM currently only functions with this support if code is not attempting to run from the emulated flash. This issue does not affect QEMU. | |||
Revision as of 00:15, 14 March 2011
This is a proposal for PC System Flash emulation for on QEMU/KVM.
Flash Hardware
Leverage the pre-existing CFI flash support in qemu/hw/pflash_cfi01.c. (Another option is to use qemu/hw/pflash_cfi02.c.)
Command line interface
Today the (currently existing) -pflash parameter has no use with an x86 or x86-64 system. To enable PC system flash, this parameter would now be used on x86 & x86-64 systems. The -bios and -pflash parameters would both now have a use with qemu/kvm:
| -bios used | -pflash used | Result |
|---|---|---|
| (no change) 'bios.bin' will be loaded as rom image. | ||
| (changing) -pflash parameter will be loaded as flash image just below 4GB.
'bios.bin' will be ignored. | ||
| (no change) -bios parameter will be loaded as rom image. | ||
| (changing) -bios parameter will be loaded as rom image just below 4GB.
-pflash parameter will be loaded as flash image just below the bios rom image. |
Known Issues
- KVM will not boot if -pflash is used and -bios is not used. KVM currently only functions with this support if code is not attempting to run from the emulated flash. This issue does not affect QEMU.