Re: [LinuxBIOS] retrieving MAC from romstrap
On Thu, Sep 27, 2007 at 05:44:29PM +0200, Peter Stuge wrote: On Thu, Sep 27, 2007 at 04:20:28PM +0200, Robert Millan wrote: I just wrote a small utility to set the appropiate bytes in linuxbios.rom. Any comments? I prefer the xxd trick. Note that I am exclusively working on systems where (I can make sure) xxd is available. Looking at the manpage, it seems that xxd is aimed at a different kind of use. I'm a bit skeptic about it being able to do that job (specialy about handling bit shifting, endianess and negative offsets). Perhaps you could show an example? -- Robert Millan GPLv2 I know my rights; I want my phone call! DRM What use is a phone call, if you are unable to speak? (as seen on /.) -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
Re: [LinuxBIOS] retrieving MAC from romstrap
On 9/26/07, Robert Millan [EMAIL PROTECTED] wrote: unsigned long mac_pos; mac_pos = 0xffd0; // refer to romstrap.inc and romstrap.lds mac_l = readl(mac_pos) + nic_index; mac_h = readl(mac_pos + 4); and can't understand what is this romstrap and why it retrieves the MAC from it in runtime. Is this some kind of legacy interface? Wouldn't it be simpler to just hardcode it during build? E.g. see attached patch. Maybe simpler, but not really correct. What if you have 2 of your boards? With your patch, you have to compile twice. That's not elegant. If you can make just one ROM image, and then automatically change the MAC at a specified location inside of it for each individual motherboard, things work better. (AMI/award/etc do this, when you use their flash utilities, it does not overwrite the MAC so you don't lose it) Your solution is ok if you want to just support your single board on your desktop, but for anybody trying to make a commercial product with LB, they won't want to be recompiling for each unit shipped. -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
Re: [LinuxBIOS] retrieving MAC from romstrap
On Wed, Sep 26, 2007 at 05:02:33PM -0400, Tom Sylla wrote: On 9/26/07, Robert Millan [EMAIL PROTECTED] wrote: unsigned long mac_pos; mac_pos = 0xffd0; // refer to romstrap.inc and romstrap.lds mac_l = readl(mac_pos) + nic_index; mac_h = readl(mac_pos + 4); and can't understand what is this romstrap and why it retrieves the MAC from it in runtime. Is this some kind of legacy interface? Wouldn't it be simpler to just hardcode it during build? E.g. see attached patch. Maybe simpler, but not really correct. What if you have 2 of your boards? With your patch, you have to compile twice. That's not elegant. If you can make just one ROM image, and then automatically change the MAC at a specified location inside of it for each individual motherboard, things work better. (AMI/award/etc do this, when you use their flash utilities, it does not overwrite the MAC so you don't lose it) Your solution is ok if you want to just support your single board on your desktop, but for anybody trying to make a commercial product with LB, they won't want to be recompiling for each unit shipped. Agreed. MACs are a bit of a pain (also on the MCP55), and we currently do not have a good way to deal with them. I have MCP55-based LinuxBIOS machines in production that have 00:00:00:00:00:00 as MAC address for each interface, and I need to force the MAC manually in /etc/network/interfaces. Not elegant, and not ideal. The kernel does not like it either, on startup it says 'complain to your bios vendor' ;) I would like a way to change the MAC address for a rom image with some tool - ideally as an option to flashrom, I guess. Keep in mind that there can be multiple addresses on a board! Thanks, Ward. -- Ward Vandewege [EMAIL PROTECTED] Free Software Foundation - Senior System Administrator -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
Re: [LinuxBIOS] retrieving MAC from romstrap
On 9/26/07, Ward Vandewege [EMAIL PROTECTED] wrote: I would like a way to change the MAC address for a rom image with some tool - ideally as an option to flashrom, I guess. Keep in mind that there can be multiple addresses on a board! There are many ways to do this in Linux-land. xxd-sed-xxd would certainly be one easy way. (maybe dd would would even work) -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
Re: [LinuxBIOS] retrieving MAC from romstrap
Mailed to soon, xxd does patching directly: --- Patch the date in the file xxd.1 % echo '029: 3574 68' | xxd -r - xxd.1 % xxd -s 0x28 -l 12 -c 12 xxd.1 028: 3235 7468 204d 6179 2031 3939 25th May 199 --- On 9/26/07, Ward Vandewege [EMAIL PROTECTED] wrote: On Wed, Sep 26, 2007 at 05:02:33PM -0400, Tom Sylla wrote: On 9/26/07, Robert Millan [EMAIL PROTECTED] wrote: unsigned long mac_pos; mac_pos = 0xffd0; // refer to romstrap.inc and romstrap.lds mac_l = readl(mac_pos) + nic_index; mac_h = readl(mac_pos + 4); and can't understand what is this romstrap and why it retrieves the MAC from it in runtime. Is this some kind of legacy interface? Wouldn't it be simpler to just hardcode it during build? E.g. see attached patch. Maybe simpler, but not really correct. What if you have 2 of your boards? With your patch, you have to compile twice. That's not elegant. If you can make just one ROM image, and then automatically change the MAC at a specified location inside of it for each individual motherboard, things work better. (AMI/award/etc do this, when you use their flash utilities, it does not overwrite the MAC so you don't lose it) Your solution is ok if you want to just support your single board on your desktop, but for anybody trying to make a commercial product with LB, they won't want to be recompiling for each unit shipped. Agreed. MACs are a bit of a pain (also on the MCP55), and we currently do not have a good way to deal with them. I have MCP55-based LinuxBIOS machines in production that have 00:00:00:00:00:00 as MAC address for each interface, and I need to force the MAC manually in /etc/network/interfaces. Not elegant, and not ideal. The kernel does not like it either, on startup it says 'complain to your bios vendor' ;) I would like a way to change the MAC address for a rom image with some tool - ideally as an option to flashrom, I guess. Keep in mind that there can be multiple addresses on a board! Thanks, Ward. -- Ward Vandewege [EMAIL PROTECTED] Free Software Foundation - Senior System Administrator -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
Re: [LinuxBIOS] retrieving MAC from romstrap
I would like a way to change the MAC address for a rom image with some tool - ideally as an option to flashrom, I guess. Keep in mind that there can be multiple addresses on a board! 1. use flashrom with exclude range to keep the old mac... 2. add some script to read out and mac, and flash linuxbios, and write back mac addr again. YH -- linuxbios mailing list linuxbios@linuxbios.org http://www.linuxbios.org/mailman/listinfo/linuxbios
