Am 09.09.2012 14:15, schrieb Peter Hüwe: > Am Sonntag, 9. September 2012, 13:28:38 schrieb Jean Delvare: >> Thanks for the info. I thought UML was no longer used with all the >> virtualization solutions available, but apparently I was wrong. > I guess it's mainly used for sandboxing, testing and development ;)
It's mostly used where KVM does not work. For example low end i586 servers in schools. Using UML you can still run 10+ instances on a P3 with 512MiB ram. > >> My bet is that all I2C bus drivers do use I/O or memory mapped >> operations directly or indirectly, except i2c-stub. So it would >> probably make more sense, and be a less intrusive change, to move the >> HAS_IOMEM dependency to drivers/i2c/busses, and move (logically or for >> real) i2c-stub out of it. >> >> Or are there really other I2C bus drivers which make sense to enable >> under UML? > The only other available in UML which doesn't rely on HAS_IOMEM is the > PARPORT_LIGHT which relies on direct io access - so I guess this one doesn't > make sense either. > > I created a patch for your proposed solution, I moved the stub driver to the > end in order to have only one big if HAS_IOMEM. UML does not have IO_MEM but some sub-systems have "depend HAS_IOMEM" which is often too coarse grained. To deal with that I've introduced GENERIC_IO some time ago to support MTD (and nandsim) on UML. Maybe some parts of the I2C sub-system can also just depend on GENERIC_IO instead of HAS_IOMEM. An arch has GENERIC_IO=y if it supports everything defined in generic-asm/io.h which is more than enough for most stub drivers. Please look at this patch series: https://lkml.org/lkml/2012/2/6/489 I'm sure it will help you in bringing I2C to UML. Thanks, //richard
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