Re: [Xen-devel] [PATCH 1/5] tools/firmware: Build ipxe as a standalone ROM

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 16/03/18 11:18, Jan Beulich wrote:
>
>> @@ -113,6 +114,11 @@ endif
>>  
>>      mv $@.new $@
>>  
>> +ifneq ($(ETHERBOOT_ROMS),)
>> +$(ETHERBOOT_ROM): $(ETHERBOOT_ROMS)
>> +    cat $^ > $@
>> +endif
> I don't understand this: How can the bare concatenation of multiple
> binary blobs produce anything usable? How will the consumer know
> where the boundaries are, and which one is which?

These details are all covered in the option ROM/PnP metadata.  See
scan_etherboot_nic()/scan_option_rom() in hvmloader.

~Andrew

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