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romburning [2007/11/19 13:22]
mcb30
romburning [2010/08/28 14:30] (current)
alecjw
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-====== Burning gPXE into ROM ======+ ====== Burning gPXE into ROM ======
  
-For a permanent deployment of gPXE, you can burn it into your network card's ROM.  This will replace any legacy PXE ROM code provided by your network ​card vendor.+For a permanent deployment of gPXE, you can burn it into your network card'​s ​expansion ​ROM, as a replacement for the card'​s ​legacy PXE ROM.  Most modern ​network ​cards store their expansion ROMs in flash memory, and most manufacturers will provide a utility to allow you to update the expansion ROM.
  
-{{ :​nic.jpeg?​237x222|A network card}}+{{:​nic.jpeg?​237x222 |A network card}}
  
-The gPXE ROM will show up as a boot device in the BIOS boot menu.  Some BIOSes do not show specific devices, but you will still be able to boot from the gPXE ROM using the generic "Boot from LAN" ​setting.+The gPXE ROM will show up as a boot device in the BIOS boot menu.  Some BIOSes do not show specific devices ​in the boot menu, but instead show a generic ​option such as "Boot from LAN".
  
 The gPXE ROM will become a permanent fixture of your network card; if you move the card to another machine then the gPXE ROM will be available in the new machine. The gPXE ROM will become a permanent fixture of your network card; if you move the card to another machine then the gPXE ROM will be available in the new machine.
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     02:00.0 Class 0200: 1186:4300 (rev 10)     02:00.0 Class 0200: 1186:4300 (rev 10)
  
-Make a note of the vendor and device IDs (//1186// and //4300// respectively in the above example). ​ [[:​download|Download]] gPXE and build a ROM image for these PCI IDs:+Make a note of the vendor and device IDs (//1186// and //4300// respectively in the above example). 
 + 
 +===== Building the ROM image ===== 
 + 
 +[[:​download|Download]] gPXE and build a ROM image:
  
     cd gpxe/src     cd gpxe/src
-    make bin/pci_1186_4300.rom+    make bin/11864300.rom 
 + 
 +{{ :​bootrom.jpeg?​120x96|An expansion ROM}} 
 + 
 +where //1186// and //4300// are the PCI vendor and device IDs for your network card.  Make a note of the ROM image file (//​bin/​11864300.rom//​ in the above example). 
 + 
 +Check the size of the ROM image file. If your BIOS does not support PCI 3.0, it must fit alongside any other option ROMs in your system (video cards often take up 50kb or so, and bootable RAID and SCSI controllers take up space as well) in the 128kb option ROM space. If you overflow this space, the result will depend on your BIOS; maybe gPXE won't be loaded at all, maybe you'll get an error message with an option to continue, maybe your boot will freeze entirely. To recover the NIC in the latter situation, see the "​Recovering from a bad flash" section below. 
 + 
 +===== Burning the image into ROM ===== 
 + 
 +To burn the image file into ROM, you will need to use a utility specific to your network card.  Instructions are available for: 
 + 
 +  * [[:​romburning:​intel|Most Intel adapters]] 
 +  * [[:​romburning:​tg3|Broadcom 57xx based adapters (tg3)]] 
 +  * [[:​romburning:​3com|3COM 3C905 adapters]] 
 +  * [[:​romburning:​qemu|QEMU option ROM]] 
 +  * [[:​romburning:​vbox|VirtualBox LAN boot ROM]] 
 +  * [[:​appnotes:​gpxeonvmware|VMware e1000 ROM]] 
 + 
 +It probably goes without saying, but you should not boot DOS over SAN from the NIC you're flashing in order to flash it! MEMDISK is safe, though. 
 + 
 +===== Recovering from a bad flash ===== 
 +If you accidentally burn a corrupted ROM image file, or with some buggy BIOSes even a perfectly fine one that's large enough to overflow option ROM space, you will likely run into a dilemma: you can't boot your system with the NIC installed, but you need to run a program with the NIC installed in order to reflash it. The solution to this is //not// an attempt at PCI hot-plugging (it has been tried and did not work); instead, try these suggestions.
  
-where //1186// and //4300// are the PCI vendor and device IDs for your network card.+Most likely you will be able to enter BIOS Setup before ​the point at which your boot fails. Search ​for any option to disable Option ROM scan, either globally or for the PCI slot containing ​your network card. Try putting gPXE very late in the boot process. If you own a ROM burner and your NIC has a socketed ROM, you can use the ROM burner to erase the ROM; the BIOS won't try booting any option ROM that's missing the 55 AA signature.
  
 +If that doesn'​t work, you'll need to acquire another gPXE-flashable NIC. Take the bad NIC out of your computer, and flash gPXE onto the new NIC. Put both NICs in your computer, such that the new NIC has a lower PCI bus:dev:fn number than the bad NIC; usually this means the new NIC should be closer to the CPU. Now boot. The BIOS will scan for option ROMs in PCI bus order, so gPXE on the new NIC gets called to initialize itself before the old NIC has a chance to screw things up. When you get prompted with
 +  Press Ctrl-B to configure gPXE...
 +do so. You now have a regular gPXE prompt, capable of loading e.g. a DOS floppy using MEMDISK that contains a flash tool to fix your broken NIC.

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