Options for boot program
My way of operating is to multi-task almost all the time. As such, while working on one task, if another task on which I am also working (but had to pause in it because some information or equipment that the task needed wasn't available) of higher priority suddenly became available/operable, then I would want to know about this so that I could switch to the higher priority task. Thus I want that the computer should tell me that it needs input for one of its tasks, or that some task is showing output that I may want to see (this usually means error messages rather than standard output). The best way for the computer to tell me these things (i.e., to call my attention to itself) is by sound (because the ear detects from all around, while the eye detects only from in front of itself [so I would have to be looking at the screen]). Thus I can do other things and be called back to the computer as needed. Hence I want the boot program to sound a bell (possibly several times with a short interval to wait between successive times, and proceed immediately when I respond [and not wait for a set # of bells to be sounded]) if it is waiting for input (say, as to which slice to boot), and the amount of time (in seconds) that it waits for that input, and if it doesn't get any input before this time period expires, it boots the current default slice. I want to set the length of this time period (to wait before booting the current default slice). I realize that other users of the boot program may want it to behave differently than I do. Consequently, each user should be able to tell the boot program how he wants it to behave regarding these matters, and other matters that some user may be able to describe. A programmer of the boot program should not impose his preferences on the users of the boot program, but code in a way that allows them to get their preferred operation from the boot program. This can't be easily/safely done by options in the call of the boot program because the boot program isn't called (as we are familiar with it). It is read into RAM from the boot sector and then control is transferred to it, and all this is done by the BIOS or a small program built into the hardware of a computer. One way to make the boot program aware of a user's preferences is to store these preferences (options) in the boot sector, say the last byte or two of that sector. That way, this data will not have a chance of being in the midst of code. The setting of these bytes can be done as part of the installation of the boot program, and/or have a special patch program that patches just this area (even after installation so if the owner wants to change his options after installation, he can easily do so). I would like to suggest some minor changes to the boot program for FreeBSD , mainly in the area of options that the user can set when installing it. Hopefully the space available for the boot program will be big enough to allow these changes. By the way, is there more space available (e.g., more sectors on the platter/cylinder) for the boot program? Where can one get the code for the boot? Also, how much space is available for the boot code? Also, can one add more slices (so there are more than 4) to the system, and have ways of booting them. Another thing that could be done is to introduce logical slice (the term has been used before), say by allowing more than 8 partitions per slice and allowing the user to be able to specify which set of 5 to mount (and these 5 form a logical slice). ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Options for boot program
On Thu, 15 Jun 2006 07:02:11 GMT, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: My way of operating is to multi-task almost all the time [...] Hence I want the boot program to sound a bell (possibly several times with a short interval to wait between successive times, and proceed immediately when I respond [and not wait for a set # of bells to be sounded]) if it is waiting for input [...] I realize that other users of the boot program may want it to behave differently than I do. Consequently, each user should be able to tell the boot program how he wants it to behave regarding these matters, and other matters that some user may be able to describe [...] One way to make the boot program aware of a user's preferences is to store these preferences (options) in the boot sector [...] I apologise in advance if excessive snipping was done above, but I tried to keep your major points intact. I don't think it is a good idea to try to cram more features in the severely limited space the boot0 stage currently has. The entire boot0 object code should fit in less than 512 bytes (some of that space is used to store the BIOS-partition table too). Adding more and more features every time we want to extend it will quickly make it either buggy or unusable for the majority of the people who currently use it. On the other hand, there are other boot managers, which can use more space and are not as limited. It may be a good idea to try one of those and extend it to cover your needs. A very featureful and nice option is GRUB, which -AFAIK- currently supports Windows, Linux, FreeBSD, Solaris and a few other OSes. Unfortunately, the GRUB port of FreeBSD is i386-only, so if you are running something else (sparc64 or amd64), it is impossible to use it. I'd put my own money into porting GRUB to work with all the major architectures currently supported by FreeBSD. Then, I would add the features you like to GRUB, which already includes an extended set of configuration options and can easily incorporate more. I would like to suggest some minor changes to the boot program for FreeBSD , mainly in the area of options that the user can set when installing it. Hopefully the space available for the boot program will be big enough to allow these changes. By the way, is there more space available (e.g., more sectors on the platter/cylinder) for the boot program? Not much space is available. Where can one get the code for the boot? The source code for the boot0-stage loader is: http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/boot/i386/boot0/boot0.S Also, how much space is available for the boot code? A very small number of bytes. Forget about this, if you ask me... - Giorgos ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Options for boot program
I can identify with your condition. :) Unfortunately, the early boot loaders (boot0, and boot1+boot2) are simply too tight on space to add more features. I think boot0 literally has 0 or 1 bytes free right now. However /boot/loader has a lot more free space and can be easily and intuitively configured via /boot/loader.conf. All of the boot code can be found under src/sys/boot. -- John Baldwin ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Options for boot program
I don't know why I was included in the CC list for this thread, nor do I have any input on the subject. Please trim my address from the CC list. Thanks. -- Darren Pilgrim ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to [EMAIL PROTECTED]
