Date: Fri, 7 Jan 2000 16:01:47 -0600 (CST) From: De la Cruz Lugo Eric <eric@iteso.mx> To: Warner Losh <imp@village.org> Cc: freebsd-alpha@FreeBSD.ORG Subject: Re: HARDWARE.TXT specific for Alpha? Message-ID: <Pine.BSF.4.10.10001071558030.78686-100000@iteso.mx> In-Reply-To: <200001072129.OAA88896@harmony.village.org>
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Yes, in fact i was refering to FreeBSD on x86, where the known limit is 4 GB (unless of course some one think otherwise). taking this, theoretically what its the posible max RAM memory in Alpha? (repeat only in theory). thanks in advance. Eric De La Cruz Lugo Merida, Yucatan, Mexico, The Maya Land On Fri, 7 Jan 2000, Warner Losh wrote: > In message <Pine.BSF.4.10.10001070928460.83671-100000@iteso.mx> De la Cruz Lugo Eric writes: > : Thanks for the info, in X86 Architecture the RAM max size is 4 GB (check > : ftp.cdrom configuration :), i thinked that in Alpha should be bigger. > > No. That's not right. PPro and newer support 36 bits of physical > address, which leads to a max size of 64G. The biggest Mobo I've seen > for x86 is 8GB (and that was second hand info about a micron server > mobo). FreeBSD can't go above 4G w/o rewriting all DMA customers to > use bus_dma, which are the network drivers iirc. The pmap layer would > also require a fair amount of work as well. But I drift from the > charter of this group now :-) > > Warner > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-alpha" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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