the grub.svgz is the illustration of the boot process, it may be a little hard to read... and the configurations are uploaded to somewhere else, here is the link: http://pan.baidu.com/s/1o6qYzgA
在 2015年7月25日星期六 UTC+8下午8:07:10，rt.写道： > > my USB flash was divided into two partitions, the first one serves > as a normal partition for file saving and the second one is only for > booting purpose, all the livecd are saved in the second partition managed > by grub2, the configuration files are placed in the attachment, to have it > bootable in both legacy bios mode and uefi mode, you will have to install > grub2 in two ways for targets, one is the i386( called like this in > grub2),another is x86_64-efi, I install it with the following commands: > > grub-install --removable --recheck --target=x86_64-efi > --efi-directory=/run/media/root/r\&t > --boot-directory=/run/media/root/r\&t/boot/grub/x86_64-efi > grub-install --recheck --removable --target=i386-pc > --boot-directory=/run/media/root/r\&t/boot/grub/i386-pc /dev/sdb > > before the two commands, you should already have the target > partition mounted on the right place( here is /run/media/root/r\&t/ ), the > i386-pc targets need write data to mbr, while the x86_64-efi boot from efi > excutable file which is loaded directly by bios with uefi support, that's a > feature of uefi. As for 'secure boot', it's so called but it prohibit any > loader unsigned or signed with a wrong key( more often the key belongs to > Microsoft, but for some machine you can also install your own key), about > how to boot with secure boot on, here is some more detailed refrence: > www.rodsbooks.com/efi-bootloaders/index.html > an announcement about 'secure boot' by fsf two or three years ago: > > http://www.fsf.org/campaigns/secure-boot-vs-restricted-boot/statement > > the two targets share nearly the same configurations which are > located in /boot/grub/grub2_share/cfg, some file were removed to shrink the > file size, so it's not ready to boot, but the arrangement of the file can > be referenced. > the main file for sagemath is placed in the same path as they are > arranged in the live img, here in my USB flash, it's the directory '/live', > the corresponding configuration is in 0_gnu_linux.cfg. > among the files, /boot/grub/grub2_share/cfg/*.cfg and > /boot/grub/$target/grub/grub.cfg is what you can refer, the other files > were left just in case that you need. > > > 在 2015年7月25日星期六 UTC+8下午7:50:01，rt.写道： >> >> e.. not really, I'm just a junior student now and interested in computer >> techniques. >> >> sorry to reply so late, we are having a field work and these days it >> seems that the ipv6 was not available or not stable enough, I was blocked >> and can't have access to google, so is this forum. Just now, I tried >> several times and finally I am lucky to send this message! >> >> grub2 is of course a free software, it's also made by GNU project as an >> update to legacy grub! As for my grub2 configuration, it seems that it will >> take some space to write it. I will try to conclude it here. Besides, you >> can find more instruction about it in the official manual. >> >> there is a great chance that you will have to fsck your usb flash disk, >> at leastfor sage live 6.5 or earlier 6.4, but that's easy to deal with and >> still acceptable. for the new version 6.7, I'm not sure as my laptop is now >> more convinient, so I haven't got to try the new version now. >> It should be claimed that not only sagemath, but also many live cd would >> couase the problem, and sagemath have tried to deal with this issue through >> several more convenient methods, though it's not auto done now. >> >> >> it is little long to say about the boot mode uefi and legacy bios, it's >> better that you find the explanation somewhere else, two place I recommend >> is the uefi official webset and tiannocore, as I first learned it from all >> kinds of forum, most of which were wrote in Chinese ... >> >> as for matlab, I just leared little, and it was already one year ago. as >> now I don't want to spend much time on it, I can't tell much about it, >> sorry. However, for matlab, there is a big problem, it's not free, not only >> the charge but also not open source; also, it takes lots of disk space( my >> hard disk is just a little inadequate to save all my files). Several weeks >> ago, I tried ansys under the linux, finaly got defeated and will never want >> to have ansys installed on linux again, there is so many troubles with it, >> and hardly have documents, I'm afraid that matlab would have the same >> circumstance, but that's just the third reason. Now sagemath is just >> powerful enough and script is so convenient to use. With additional tools, >> like a frontend( for example texmacs, with witch the formula displayed is >> easy to read ), it can meet nearly all what I need, there is no reason for >> me to try matlab again. >> >> maybe later I will try to add a map to illustrate how the grub2 works for > my USB flash, hoping the net will hold on ... > > it seems it's no easy to upload files here, I will try to make it later.. > > >> >> 在 2015年7月22日星期三 UTC+8上午3:35:08，Dominique Laurain写道： >>> >>> Hi rt, >>> >>> you are advanced student, aren't you ? ... :-) >>> >>> yes, it will be good to share about grub2 like Thierry did/does for his >>> technical data...either in your own blog or you post it for some interested >>> sage users or dev. >>> >>> I know only "grub" at my job, but maybe grub2 is more up to date. I >>> guess many "details" are very important : how did you partition disk to >>> handle the boot process from the grub to the chosen ISO file ? is grub2 >>> free (no money to pay to install it) ? ... >>> >>> I don't know just now, what it means "uefi" or "secure boot is off" ... >>> you can write short explanation (or reference websites) about what you did >>> (no need to mention what you have not tried yourself). >>> >>> MATLAB can have advantages too : if you have the chance (for example >>> usage free with school) to use MATLAB, do it...you will understand you >>> didn't miss opportunity later,... you can compare and explain better your >>> ideas why SAGE is very good. Keep written notes about good or bad >>> experiences. >>> >>> Dominique. >>> >> -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. 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