Date: Thu, 11 Sep 2008 13:55:01 +0100 From: Bruce M Simpson <bms@incunabulum.net> To: FreeBSD stable <freebsd-stable@freebsd.org> Cc: Konstantin Belousov <kib@FreeBSD.org>, John Baldwin <jhb@freebsd.org> Subject: Long delays for USB realbtx boot Message-ID: <48C91525.10806@incunabulum.net>
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Hi, I have hacked NanoBSD locally to deal with generation of images for booting off USB keys. I am using the RELENG_7 branch as real-mode BTX support is necessary to support USB boot. During testing I noticed that whilst the images eventually boot, there is an extremely long delay before doing so, between when the BIOS reads the boot sector and when the BTX loader messages appear. Test system Time ---------------------------- Thinkpad T43 1m 40s ASUS Vintage AH-1 1m 7s Any ideas why this long delay is occuring? I see this with MBR geometries prepared for both USB-HDD (255H/63S/xxC) and USB-ZIP (64H/32S/xxC) modes. I am not using the strict USB-ZIP mode where everything resides on the 4th slice (da0s4) at the moment, as it requires further NanoBSD patches. I am not currently generating images sized to the entire USB key to save space and time, so the cylinder size is smaller than the physical media, this might also be a factor. Thanks for any light you can shed on this. cheers, BMS
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