Date: Fri, 25 Mar 2005 21:52:17 +0000 From: Ian Dowse <iedowse@maths.tcd.ie> To: Maxim Sobolev <sobomax@portaone.com> Cc: cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/dev/usb usb.c Message-ID: <200503252152.aa84241@salmon.maths.tcd.ie> In-Reply-To: Your message of "Fri, 25 Mar 2005 20:51:57 GMT." <200503252051.aa57514@salmon.maths.tcd.ie>
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In message <200503252051.aa57514@salmon.maths.tcd.ie>, Ian Dowse writes: >In message <424473BB.4010607@portaone.com>, Maxim Sobolev writes: >>This is still suboptimal, since even after this change when ehci is >>enabled some (if not most) USB devices are detected after system goes >>into milti-user mode. Obviously, this makes it impossible to mount root >>fs off the USB HDD/FDD/CD. The simplest way to solve this problem is to >>add some sufficiently long and configurable delay before mounting root >>fs (similar to one used by the SCSI) when ehci is enabled to let those >>devices to be detected and attached. > >Could you send me an example dmesg that shows this? As far as I >know, doing the explore when cold == 1 should attach all USB devices >before even interrupts are enabled. > >This should be the case with PCI USB host controllers that are >compiled into the kernel or pre-loaded by the loader - if you load >the module later and I think also with cardbus USB controllers, >then the USB host controller won't get attached with cold == 1 so >none of the early exploration code runs. Booting from a USB disk and using it as the root filesystem works on my laptop anyway: sc0: VGA <16 virtual consoles, flags=0x300> vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0 umass0: USB Flash Disk, rev 2.00/2.00, addr 2 Timecounter "TSC" frequency 1000038929 Hz quality 800 Timecounters tick every 1.000 msec ad0: 38154MB <IC25N040ATMR04-0/MO2OAD4A> [77520/16/63] at ata0-master UDMA100 da0 at umass-sim0 bus 0 target 0 lun 0 da0: <JetFlash TS256MJF2B 2.00> Removable Direct Access SCSI-2 device da0: 40.000MB/s transfers da0: 250MB (512000 512 byte sectors: 64H 32S/T 250C) Trying to mount root from ufs:/dev/da0s1a Pre-seeding PRNG: Ian
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