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wiki:ubuntu910 [2009/10/19 14:56] less1 created |
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| This page will document progress and problems faced in supporting Ubuntu 9.10 in BKO. | This page will document progress and problems faced in supporting Ubuntu 9.10 in BKO. | ||
| - | ===== new format for initrd ===== | + | ====== Current Status ====== |
| + | * Ubuntu is booting over network using pxe, but its not able to mount the iso and use it. | ||
| + | * Ubuntu is booting as long as URL to ISO is containing IP instead of URL, its same old dns resolv problem. | ||
| + | * Ubuntu with httpfs is working :-) | ||
| + | * I am using ugly hack to populate ''/etc/resolv.conf'' file with public DNS entries. | ||
| + | * So it may not work in place where public DNS queries are not allowed. | ||
| + | |||
| + | |||
| + | ===== Steps in adding Ubuntu 9.10 in BKO ===== | ||
| + | - Get the 9.10 ISO. - done | ||
| + | - Extract the linux kernel image, initrd image. - done (location [[http://git.etherboot.org/?p=people/pravin/BKO.git;a=tree;f=bko/live/ubuntu/U9.10|bko/live/ubuntu/U9.10/]]) | ||
| + | - Get kernel modules needed for iscsi support from iso. | ||
| + | - Modify initrd image ( to be done by [[http://git.etherboot.org/?p=people/pravin/BKO.git;a=history;f=bko/live/ubuntu/U9.10/generate_initrd.sh|generate_initrd.sh]] script ) | ||
| + | - adding tools needed to support httpfs and iscsi mounting - Done | ||
| + | - add kernel modules for iscsi support to initrd. - Done | ||
| + | - edit the "scripts/casper" inside initrd image. - Done | ||
| + | - Turn on the networking. | ||
| + | - configure the network to use boot parameters for ''IP'' or use ''dhcp'' | ||
| + | - to use above tools and mount the ISO image over Internet. | ||
| + | - Modify code such that mounted ISO will be used for booting instead real cdrom. | ||
| + | - Compress back the initrd image. __Problems in doing this__ | ||
| + | - Used unmodified linux kernel image and modified initrd image to boot the system. | ||
| + | - Most probably something will go wrong and it will not work, debug those problems. | ||
| + | |||
| + | |||
| + | |||
| + | ===== Problem-1 : new format for initrd ===== | ||
| Ubuntu 9.10 is using new format for compressing initrd files. It uses ''lzma'' command for this. | Ubuntu 9.10 is using new format for compressing initrd files. It uses ''lzma'' command for this. | ||
| This is quite new format for me, so struggling little bit with it. | This is quite new format for me, so struggling little bit with it. | ||
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| I still have some problems in compressing it back. The default ''lzma'' compression | I still have some problems in compressing it back. The default ''lzma'' compression | ||
| does not match the original ''initrd.lz'' file, so I am doing something wrong here. | does not match the original ''initrd.lz'' file, so I am doing something wrong here. | ||
| + | Most probably, I need to provide proper compression level which I need to find out. | ||
| + | <code>(cd mpoint;find . | cpio -oH newc | lzma -c > ../initrd.lzma)</code> | ||
| + | |||
| + | === Soln === | ||
| + | I have to provide ''-9'' argument to lzma for work. So final command which worked | ||
| + | in ''generate_initrd.sh'' is | ||
| + | <code>sudo find . | sudo cpio -oH newc | lzma -9 -c> ../initrd.lz</code> | ||
