1 $NetBSD: FBInstall,v 1.1 2006/07/23 13:33:53 bjh21 Exp $ 2 3 Note of FastBoot/AutoBoot Installation for !BtNetBSD V0.90 4 based on !BtRiscBSD 5 6 Updated by Reinoud Zandijk 18 Feb 2001 7 Author: Mark Brinicombe 12th May 1995 8 Updated: 20th June 1997 9 10 Installation 11 ------------ 12 13 Two patches are required to the standard boot files 14 15 The following lines should be added to the start of 16 !Boot.Choices.Boot.PreDesktop 17 18 ----------------------- Cut here ----------------------- 19 20 |Start NetBSD !Boot FastBoot 21 Run <Obey$Dir>.^.^.^.BtNetBSD.!BtNetBSD.!Boot 22 Run <BtNetBSD$Dir>.TestBoot 23 If "<NetBSD$FastBoot>" = "1" THEN Echo NetBSD FastBoot mode engaged 24 If "<NetBSD$FastBoot>" = "2" THEN Echo NetBSD ConfBoot mode engaged 25 If "<NetBSD$FastBoot>" = "3" THEN Echo NetBSD AutoBoot mode engaged 26 If "<NetBSD$FastBoot>" = "4" THEN Echo NetBSD FastConf mode engaged 27 |End 28 29 ----------------------- Cut here ----------------------- 30 31 These commands should be the first one run in the PreDesktop 32 file. They boot the boot loader application (primarily to set 33 BtNetBSD$Dir). The file <BtNetBSD$Dir>.TestBoot is then run 34 to test for the ALT or CTRL keys are being held down. In addition 35 it checks several CMOS RAM bits for boot configuration options. 36 37 The following lines should be added to the start of 38 !Boot.Choices.Boot.Desktop 39 40 ----------------------- Cut here ----------------------- 41 42 |Start NetBSD !Boot FastBoot 43 Iconsprites <BtNetBSD$Dir>.!Sprites22 44 If <NetBSD$FastBoot> = 4 THEN Run <BtNetBSD$Dir>.!Edit 45 If <NetBSD$FastBoot> > 0 AND <NetBSD$FastBoot> < 4 THEN Obey <BtNetBSD$Dir>.fastboot 46 |End 47 48 ----------------------- Cut here ----------------------- 49 50 This command should be the first one run in the Desktop file. 51 It runs the NetBSD Bootloader with the configured parameters. 52 53 54 There is a specific reason for not putting all the fastboot code in 55 one file. The PreDesktop patch is run very early in the boot up so 56 that the ALT and CTRL keys can be detected quickly. However, currently 57 the actually bootloader cannot be run at this point unless a lot of 58 memory is available in the module area (~1Meg) as currently the 59 module area is used for temporary storage of the kernel being 60 booted. 61 This means that the actual boot is prosponed until the start of 62 the Desktop file. At this point the desktop has been started and 63 the task manager is running so it will be possible to allocate 64 a large amount of module space. 65 66 67 Activation 68 ---------- 69 70 Once installed, to engage the fastboot hold ALT down immediately 71 after a reset. As soon as the "fastboot engaged" message is printed 72 the ALT key can be released. 73 To engage the fastconf mode hold CTRL down immediately 74 after a reset. As soon as the "fastconf engaged" message is printed 75 the CTRL key can be released. 76 77 78 Configuration 79 ------------- 80 81 Configuration is done via the !BtNetBSD application. 82 When ever NetBSD is booted the commandline used to boot it is saved 83 by the bootloader to the file <BtNetBSD$Dir>.FastBoot 84 Rerunning this file will then boot NetBSD with the last parameters 85 used. It is this file that the fastboot uses so the fast boot will 86 boot NetBSD with the same parameters as were used for the last boot. 87 88 89 ConfBoot mode 90 ------------- 91 92 This mode is identified by NetBSD$FastBoot being set to 2. This indicates 93 that the bootloader has been configured to always boot NetBSD. This is 94 down by setting a bit in the CMOS RAM (via !BtNetBSD). 95 If NetBSD boots are configured the action of the ALT is reversed so that 96 holding down ALT will allow a RISC OS boot instead. 97 98 99 AutoBoot mode 100 ------------- 101 102 This mode is identified by NetBSD$FastBoot being set to 3. This indicates 103 that an automatic boot was requested by NetBSD before it rebooted. This 104 will happen when /sbin/reboot is used instead of /sbin/halt. 105 106 107 FastBoot mode 108 ------------- 109 110 This is the behaviour when ALT is held down at boot time and ConfBoot mode 111 has not been configured. It just bypasses most of the normal startup and 112 boots NetBSD. 113 114 115 FastConf mode 116 ------------- 117 118 This is the behaviour when CTRL is held down at boot time. This is similar to 119 FastBoot mode except that the !BtNetBSD is provided to allow boot parameters 120 to be changed. 121 122 123 Bugs 124 ---- 125 126 Well hopefully there are no bugs :-) 127
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