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On Tuesday, October 06, 2015 11:03:04 PM João Miguel wrote: |
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> > > > Possible causes: |
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> > > > 1. USB stick doesn't work as boot device |
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> > |
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> > Ok, so scratch that one. |
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> |
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> Okay, done. |
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> |
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> > > > 2. USB port is not supported by kernel |
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> > > |
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> > > I'm not sure what you mean. Is there any option I should enable for |
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> > > genkernel? I read on the Wiki page that |
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> > |
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> > It works with Arch, are you using the same kernel options now with Gentoo? |
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> |
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> Yeah, I tried many more here actually, with Arch I only need APPEND root=... |
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> (no rootfstype, ro, rw, rootdelay, etc.). |
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What about kernel config? |
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> > > > 3. You don't use root_delay as boot option |
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> > > |
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> > > If that's what I think it is, I tell syslinux to wait 5 seconds. |
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> |
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> (turns out it's not what I thought it was, though I did try root_delay, it |
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> is actually rootdelay...) |
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> |
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> > How do you tell it that? |
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> |
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> Here's my syslinux.cfg with more comments: |
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> PROMPT 1 |
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> TIMEOUT 50 # <-- here |
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That timeout is for the prompt, eg. how long the bootloader waits. |
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It will not have any effect for the drivers in the kernel to finish detecting |
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the USB devices. |
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> DEFAULT gentoo |
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> |
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> LABEL gentoo |
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> LINUX ../kernel-genkernel-x86-4.0.5-gentoo |
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> INITRD ../initramfs-genkernel-x86-4.0.5-gentoo |
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> APPEND rootdelay=5 root=UUID="6fc386ff-8342-42a2-be02-51a6eccf8430" |
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> rootfstype=ext4 # ^^--- I added this just now because you said so, |
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> though in the last message I had root_delay # Neither of those has any |
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> effect (conditions 2 and 3 I told you about remain as they were) # (as I |
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> thought this has nthing to do with the bootloader) |
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> # pen (normalmente /dev/sdb4): UUID="6fc386ff-8342-42a2-be02-51a6eccf8430" |
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> TYPE="ext4" PARTLABEL="Root Gentoo GNU/Linux" |
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> PARTUUID="9c4f6479-9dd7-4a8f-86f2-f1320cc15aa5" |
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Hmm... |
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I see 2 different UUIDs in your comments. |
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Did you test with the PARTUUID value ("9c...") instead of the other one? |
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Also, I always ended up setting the rootdelay to 10 or higher. (It's in |
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seconds, not minutes) |
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> > I never used an initrd when building my own USB sticks. |
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> |
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> I don't know, I always used an initrd. Though I must say, that is the |
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> phase of starting the PC I understand the worst. |
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On the machines where I use an initrd, I write my own scripts as I find the |
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creators (genkernel, dracut) to not be intelligent enough. |
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> > I was talking about: |
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> > rootdelay= [KNL] Delay (in seconds) to pause before |
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> > attempting to |
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> > |
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> > mount the root filesystem |
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> > |
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> > (See the file "kernel-parameters.txt" in the kernel Documentation) |
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> |
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> (I'm guessing I'm not supposed to include this in the boot loader config...) |
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The "rootdelay=..." part needs to be added to the boot loader config. |
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-- |
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Joost |
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