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On Friday 21 January 2011 11:08:39 Mark Knecht wrote: |
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> On Fri, Jan 21, 2011 at 10:45 AM, <meino.cramer@×××.de> wrote: |
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> > Hi, |
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> > |
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> > I got a little confused about the sense or nonsense of AHCI vs. IDE. |
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> > |
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> > I run a ASUS Crosshair IV Formula, which BIOS has a menu entry to |
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> > configure the SATA ports either for IDE or AHCI or RAID. Forget RAID |
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> > for a momen -- I dont use it (nothing against RAID ! ;) |
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> > |
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> > My box uses a linux 2.6.37 vanilla kernel. |
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> > |
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> > The kernel config has been set to |
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> > |
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> > CONFIG_SATA_AHCI=y |
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> > # CONFIG_SATA_AHCI_PLATFORM is not set |
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> > |
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> > In the dmesg output I found this: |
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> > |
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> > pci 0000:00:11.0: set SATA to AHCI mode |
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> > ahci 0000:00:11.0: AHCI 0001.0200 32 slots 4 ports 3 Gbps 0xf impl |
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> > SATA mode ahci 0000:07:00.0: AHCI 0001.0000 32 slots 2 ports 3 Gbps 0x3 |
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> > impl SATA mode |
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> > |
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> > despite the fact that AHCI is disabled in the BIOS settings (using |
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> > IDE). |
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> > |
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> > I did an experiment an disabled AHCI in the kernel (to make the kernel |
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> > settings consistent with the BIOS.) |
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> > |
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> > Result: The kernel did not find the root partition. |
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> > |
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> > In the meanwhile I do not understand all this never more. |
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> > |
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> > Why does the kernel boots only, if the BIOS says "IDE!" and linux |
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> > insists on "AHCI!"...and waht ist the result? |
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> > |
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> > Best regards, |
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> > mcc |
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> |
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> Hi meino, |
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> It's disappointing that Volker insists on sending these pissy |
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> little responses which don't advance the conversation. Sorry for that. |
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> |
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> Not sure I can lend any weight to the argument but it's my belief |
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> that your installation of Gentoo Linux isn't using BIOS to access the |
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> disk at all. Once the system boots and loads the kernel, then the |
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> kernel loads drivers (or uses what you built into the kernel) and |
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> takes over control of the hardware using the AHCI drivers. If the |
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> kernel doesn't use BIOS disk calls (INT13?) then it doesn't care what |
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> the BIOS thinks because the BIOS is not longer involved. It just talks |
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> directly to the hardware. |
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> |
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> I'm happy to be corrected (by Volker I'm sure) but that's my guess |
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> as to what you're seeing. |
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|
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you are confusing bios calls and bios programming chips as.... also - is there |
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any good reason to use IDE mode? Any? At all? |
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