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Topic: ehci-hcd

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roberts

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Posts: 4983
Joined: Oct. 2003

Posted: July 07 2005,21:04

This should only be affecting USB-HDD installs and not USB ZIP. The USB boot floppy will only work with USB-ZIP. The USB-HDD is extlinux and uses a different setup. The ehci-hdc.o module was left out of line 227 by Klaus Knoppix because on systems without USB 2.0 the system could hang. The module, ehci-hcd.o is already in the modules/scsi section of minirt. I can go ahead and add this module for boot up detection but it may mean some users may experience the "hang" and then have to use the nousb boot option. It is difficult to support both the old and the new and sometimes we may have to choose which is in the majority. The USB-ZIP install does not have this issue as it installs the custom made floppy just for such purpose.

crew

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Posts: 18
Joined: July 2005

Posted: July 07 2005,23:36

hey guys, it seems to work now

I followed the instructions of cbagger01,
first it still booted with usb1.1.
Then i removed the usb-uhci from the line 227,
after that it was booting with the ehci-hcd.o
I added the usb-uhci again in the line 227 and it is still booting
with the ehci-hcd.

I´ll crosscheck tomorrow, that I`ve the right linuxrc in place.

Thank you for your fast and qualified help.

@ roberts, I understand that you support the configuration
that is reasonable for the majority.
I don´t know how common this "problem" is, but I would have been happy about a hint in the documentation.
If I´ve missed it, sorry.
Regardless of that, great job!

gjhicks

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Posts: 108
Joined: April 2004

Posted: July 08 2005,00:50

Hi,

Thanks for cbagger and roberts for their helpful replies.

Have now got both the USB-ZIP and USB-HDD versions of the USB install to work fine. They both boot without a problem.

Many thanks!

However, after a search on these forums and reading the V1.1 news, as suggested in one of the posts, I am afraid that I still don't understand the relative benefits/differences of the two approaches.

I have probably overdosed on stupid pills but, aside from USB-ZIP being vfat based and 2 partitions compared to USB-HDD being ext2 based and 1 partition, the differences escape me.

Can some kind soul give a little background on why there are two approaches and reasons for preferring one over the other?

Regards,

Geoff.

roberts

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Posts: 4983
Joined: Oct. 2003

Posted: July 08 2005,01:17

I would say that most computers as of this writing would support USB-ZIP over USB-HDD. Seems only the newer computers will support USB-HDD.

USB-ZIP is based on the syslinux boot method, that is why the boot boot floppy will work. USB-ZIP being an older method seems to limited to the size of the old zip drives, i.e, it requires special geometry to get it to boot. This special geometry does not support the larger drives as extlinux does. The USB-ZIP make a small but bootable fat partiton, and the remaining a second partition. Windows can see these partitions. WinXP can only see the first partition but that is a limitiation of WinXP. Older windows can see both. Use the USB boot floppy is not able to boot USB-ZIP.

USB-HDD is based on extlinux which is similar it isolinux and why you won't find a boot floppy that will fit everthing into it. USB-HDD using extlinux has no geometry issues and can be a single linux partition. But Windows cannot see this partition. If you cannot boot USB-HDD you can still use this method by booting from the cdrom, with a boot option like: dsl fromhd=/dev/sda1 frugal

Plus don't forget DSL also offers Qemu emulation, which is by far the easiest method to get DSL on a pendrive. Just unzip it onto a pendrive, from windows run the dsl-windows.bat file and your there. But be aware that is a Virtual PC running on top of Windows, and the Virtual PC is running DSL. So, speed will be dramatically slower, also the virtual PC does not have full access to the real hardware devices, you have a small Virtual harddrive of 60MB with the standard setup. You can use samba to get access to the real drives of the system.

Pendrives, we got them covered. DSL your way.

cbagger01

Group: Members
Posts: 4264
Joined: Oct. 2003

Posted: July 08 2005,04:20

Roberts,

I have a new, slightly different approach available for your testing that combines the best of both worlds for the USBHDD users.

Since I didn't have your e-mail address handy, I sent it to Ke4nt1 for his review and to also forward it on to you.

If you don't get it soon, PM me and I'll send it directly to your account.

Regards,

-CB

14 replies since July 06 2005,23:44

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Damn Small Linux Board » Damn Small Linux » USB booting » ehci-hcd