Slowing down an XO-1.5
Mitch, Is there a simple way from OFW (or ACPI) to restrict the operating frequency of the processor in the XO-1.5 to be the lowest possible ? The relevant comment from a deployment was that they can't use full speed XO-1.5 motherboards as replacements for XO-1 motherboards. They think kids would break their laptop to get it upgraded... Cheers, wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Slowing down an XO-1.5
They'd also notice the graphics performance differences, and that wouldn't be amenable to a simple fix. -- James Cameron http://quozl.linux.org.au/ ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Slowing down an XO-1.5
On Mar 30, 2010, at 2:48 AM, James Cameron wrote: They'd also notice the graphics performance differences, and that wouldn't be amenable to a simple fix. Correct, and they would still get twice the memory and roughly 1.5 times the storage (JFFS2 is compressed). What I didn't mention is that in the course of manufacturing the processors, some of them can't run at full speed. These are lasered into a different product ID, clamped at the lowest speed, and sold as separate product with a lower price. I'd like to see/demonstrate what the performance of such a laptop would be. Cheers, wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Slowing down an XO-1.5
ok 406. 199 msr! The period after 406 is mandatory - it forces the number to be 64-bits, suitable as the data operand to msr!. John Watlington wrote: Mitch, Is there a simple way from OFW (or ACPI) to restrict the operating frequency of the processor in the XO-1.5 to be the lowest possible ? The relevant comment from a deployment was that they can't use full speed XO-1.5 motherboards as replacements for XO-1 motherboards. They think kids would break their laptop to get it upgraded... Cheers, wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Slowing down an XO-1.5
The 4 is 406 is for 400 Mhz. The normal value is a06, where a is decimal 10 for 1000 Mhz. The 6 is the voltage selection code; this processor only supports the value 6. Mitch Bradley wrote: ok 406. 199 msr! The period after 406 is mandatory - it forces the number to be 64-bits, suitable as the data operand to msr!. John Watlington wrote: Mitch, Is there a simple way from OFW (or ACPI) to restrict the operating frequency of the processor in the XO-1.5 to be the lowest possible ? The relevant comment from a deployment was that they can't use full speed XO-1.5 motherboards as replacements for XO-1 motherboards. They think kids would break their laptop to get it upgraded... Cheers, wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Slowing down an XO-1.5
Is there a simple way from OFW (or ACPI) to restrict the operating frequency of the processor in the XO-1.5 to be the lowest possible ? The relevant comment from a deployment was that they can't use full speed XO-1.5 motherboards as replacements for XO-1 motherboards. They think kids would break their laptop to get it upgraded... I would expect any kid enterprising enough to break a laptop in order to get it upgraded -- to also be enterprising enough to hack the replacement to bypass any software restrictions. Only when the replacement (despite determined attack) cannot be made better than the original would the risk of kids breaking their laptop be diminished. mikus ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
Re: Slowing down an XO-1.5
On Mar 30, 2010, at 9:56 AM, Mikus Grinbergs wrote: Is there a simple way from OFW (or ACPI) to restrict the operating frequency of the processor in the XO-1.5 to be the lowest possible ? The relevant comment from a deployment was that they can't use full speed XO-1.5 motherboards as replacements for XO-1 motherboards. They think kids would break their laptop to get it upgraded... I would expect any kid enterprising enough to break a laptop in order to get it upgraded -- to also be enterprising enough to hack the replacement to bypass any software restrictions. Only when the replacement (despite determined attack) cannot be made better than the original would the risk of kids breaking their laptop be diminished. In Uruguay, the kids can't get to OFW. And if you read further, the software hack is more tor testing the viability of motherboards using lower cost scrapped processors. wad ___ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
