On 04/10/2014 02:59, Ralf Baechle wrote: > On Wed, Apr 09, 2014 at 11:02:10PM -0400, Joshua Kinard wrote: > >> Odd, I thought R10K systems were locked to booting 64-bit kernels only. At >> least the Octane was when it was bootable. Not sure about IP27. >> >> Maybe that's another one of ARCS' ingenious features... > > No; IP27's address map is huge; a single node can take 2GB RAM. A full > blown 512 CPU system could have 0.5TB memory. Your homework for today: > try to use all that efficiently with highmem ;-) I'll need to upgrade my electrical service first. Then install a fusion power plant in the backyard, with hamster-wheel backups... > Octane is essentially a specialized, single-node IP27. It also can take > more memory than addressable in a 32 bit kernel which assumes that all memory > is visible in CKSEG0, all I/O in CKSEG1 - or you need to ioremap to CKSEG2/3. > So 32 bit kernels just don't cut it on Octane either. I believe that, in Stan's old patches, there was a cutoff at 2GB detected memory, because he never resolved a problem with DMA/PCI on machines with >2GB memory. So the machine was kinda hamstrung there anyways. That bit of code was always confusing to forward-port. If only I could finally find the motivation to figure out HEART's IRQ trickery and Linux's IRQ system... > Similarly 32 bit kernels don't cut it on other systems such as Sibyte, > SGI O2, Octane. They may be possible for some configurations but that > that's either too rarely a useful choice or too inefficient. > > Let's say 32 bit is slowly running out of juice :-) > I wonder if I'll be alive when 128-bit becomes all the rage... >>>> Are you configuring for IP22 (Indy, Indigo2 R4x00), or IP28 (R10000)? Note, >>>> IP26 (R8000) is not supported in Linux. I think OpenBSD got it working, though. >>> >>> Wish I'd have a box .... >> >> They do pop up on eBay from time-to-time. UPS destroyed the case mine came >> in, though. I've got it in a closet, with duct tape holding the teal skins >> on. It does boot to the PROM, but the RTC is probably dead by now. > > The common problem. You can cut it open with a dremel or similar tool, > disconect the internal battery and connect an external battery instead. > There are howtos for this on the web. I'm also tired of reprogramming > the MAC address again when I use my Indy so I should do this myself ... I'll probably stick to finding old DS1386's on eBay :) Never had much luck w/ those cutting discs on a Dremel tool. They shatter too easily and send little shards of pain flying across the room. -- Joshua Kinard Gentoo/MIPS kumba@xxxxxxxxxx 4096R/D25D95E3 2011-03-28 "The past tempts us, the present confuses us, the future frightens us. And our lives slip away, moment by moment, lost in that vast, terrible in-between." --Emperor Turhan, Centauri Republic
