[ipxe-devel] "Installation failed" on 3Com 905B cards

Michael Brown mcb30 at ipxe.org
Wed Mar 13 23:28:57 UTC 2019

On 13/03/2019 17:26, Quinn Plattel wrote:
> Thanks for the quick response.  Here is the banner message:
> iPXE (http://ipxe.org) 04:04.0 6800 PCI3.00 PnP PMM+00106D80+00000000 CE00
> Press Ctrl-B to configure iPXE (PCI 04:04.0)...

Thanks; that explains the root cause of the problem.

The BIOS is allocating a PMM block at 0x106d80 to hold a copy of the raw 
ROM image, but failing the second PMM allocation for the temporary 
decompression area.

The default temporary decompression area used by iPXE if PMM allocation 
fails is at 0x100000 (i.e. the start of high memory).  The decompressed 
ROM image is therefore overwriting the copy of the raw ROM image, which 
leads to the CRC32 checksum failure.

What banner line did you get on this system with the (working) DFE-530TX?



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