Re: [Qemu-devel] ARM Big endian system emulation
On Sat, Apr 28, 2007 at 01:23:36AM +0200, Alexis Berlemont wrote: Do you know some other big-endian platform ? Mostly Intel IXP stuff. Most ixp4xx used to run in big-endian mode (but a lot of them switched to little-endian when the network driver was made to work in little- endian mode), and most ixp2000 and ixp23xx systems these days are still run in big-endian mode.
Re: [Qemu-devel] ARM Big endian system emulation
Hi, Many thanks for your answer. I have a question concerning the system emulation features : what is missing in the implementation of qemu to get a system emulation of a big endian ARM1026 target (like qemu-armeb for user emulation) ? In theory most of the bits should be there. However I don't have big-endian hardware to test against, I had a look at the integrator cp user guide. This board and the related core modules are supposed to be able to work in big endian mode (even if some components are not compatible like the Ethernet controller). Do you know some other big-endian platform ? I do not understand one more issue: I do not guess how a real big-endian board can be useful. Is it for checking whether the Linux kernel is working in such a configuration ? Best regards. Alexis.
Re: [Qemu-devel] ARM Big endian system emulation
In theory most of the bits should be there. However I don't have big-endian hardware to test against, I had a look at the integrator cp user guide. This board and the related core modules are supposed to be able to work in big endian mode (even if some components are not compatible like the Ethernet controller). Sort-of. The Integrator boards aren't really big-endian, they're a little endian board with a CPU that can switch endianness. Do you know some other big-endian platform ? There are many big-endian platforms. I do not understand one more issue: I do not guess how a real big-endian board can be useful. Is it for checking whether the Linux kernel is working in such a configuration ? I have very little confidence in linux actually working in big-endian mode on an integrator. I'd also expect some of the consequences to switching to big-endian mode to be non-obvious. Access to real hadware allows you to check whether you're hitting kernel bugs or qemu bugs. Paul
Re: [Qemu-devel] ARM Big endian system emulation
I have a question concerning the system emulation features : what is missing in the implementation of qemu to get a system emulation of a big endian ARM1026 target (like qemu-armeb for user emulation) ? In theory most of the bits should be there. However I don't have big-endian hardware to test against, and don't know if linux supports big-endian mode on the hardware qemu emulates. It's likely that many of the emulated devices get it wrong, because I've never made the effort to figure out what the correct behavior is. Paul
