On 15/06/17 22:36, Guenter Roeck wrote: > On Thu, Jun 15, 2017 at 06:57:30PM +0100, Mark Cave-Ayland wrote: >> On 15/06/17 16:43, Pasha Tatashin wrote: >> >>> I have not used qemu for SPARC, so I am not fully aware of its >>> capability. The changes in this work touched three types of CPUs: >> >> The default CPU in QEMU for sun4u is the TI UltraSparc IIi, and the >> device tree is roughly similar to that of an Ultra 5, or it least it >> will be soon when I've finished working on my latest round of patches. >> >> Currently I'm booting one of John Paul Adrian Glaubitz's Debian 9 images >> and the timestamps stay at 0 until the clock is initialised so I'd hope >> that these patches would fix that. Do they require any PROM support at all? >> >>> 1. UltraSPARC IIe (Hummingbird) >>> - %stick is in I/O space, need at least to loads to get upper >>> and lower part of stick value. >>> 2. Spitfire >>> - Use %tick and cpu frequency to determine that clock. This is >>> what you tested with TI UltraSparc IIi >> >> So this is the path I'd expect to be exercised under QEMU. >> >>> 3. All other >>> - use %stick register and stick-frequency values. This is what >>> you tested with Fujitsu Sparc64 IV (which by the way is still >>> sun4u, I do not think qemu supports sun4v emulation) >> >> Sure it does. As of the latest 2.9 release, QEMU includes niagara >> support out of the box - see http://wiki.qemu.org/SPARC for the latest > > Do you have information on how to boot the Linux kernel for -M niagara > (assuming that is possible) ? Directions for Solaris and HelenOS don't > help much for the uninitiated :-(. I just pinged Artyom (who added sun4v support) about this and his comment was that the machine files provided in the OpenSPARCT1_Arch.1.5.tar.bz2 are hardcoded to 256MB which isn't enough to boot many standard kernels. As I'm currently sun4u only then I'm not the right person to ask about this - perhaps someone from Oracle can help? If you are interested in pursuing this further, please head over and introduce yourself on the qemu-devel list so we can all gather in one place. ATB, Mark. -- To unsubscribe from this list: send the line "unsubscribe sparclinux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
