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Date:      Tue, 18 Jul 2000 14:26:19 -0600
From:      "Justin T. Gibbs" <gibbs@plutotech.com>
To:        mjacob@feral.com
Cc:        "Justin T. Gibbs" <gibbs@FreeBSD.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sys/cam cam_ccb.h cam_xpt.c src/sys/cam/scsi scsi_all.c scsi_message.h src/sys/dev/aic7xxx aicasm_insformat.h 93cx6.c 93cx6.h ahc_eisa.c ahc_pci.c aic7xxx.c aic7xxx.h aic7xxx.reg aic7xxx.seq aicasm.c aicasm.h aicasm_gram.y ... 
Message-ID:  <200007182025.OAA53788@pluto.plutotech.com>
In-Reply-To: Your message of "Tue, 18 Jul 2000 13:16:33 PDT." <Pine.BSF.4.05.10007181316120.3387-100000@semuta.feral.com> 

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>
>Whew!
>
>What's the '39 bit addressing'?

In the past, the S/G format looked like:

uint8_t		address[4];
uint8_t		datalen[3];
uint8_t		spare;

Through some firmware manipulation, that last byte, other than a flag
bit, can be used as the 5th byte of the address.

>Also- maybe it's time to start considering 64 bit PCI

I'm hoping that being able to address 512GB will be enough
for a while.  I'd rather not expand the size of the S/G list
members for address space no-one will be touching for the
foreseeable future.

--
Justin



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