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[build] Generate random build identifier

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Randomly generate a 32-bit build identifier that can be used to
identify identical iPXE ROMs when multiple such ROMs are present in a
system (e.g. when a multi-function NIC exposes the same iPXE ROM image
via each function's expansion ROM BAR).

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2010-04-24 19:15:51 +01:00
parent 483c3c06ab
commit 58f6e55362
2 changed files with 10 additions and 2 deletions
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3
src/arch/i386/prefix/romprefix.S
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@@ -52,6 +52,9 @@ checksum:
.long 0
.previous
build_id:
.long _build_id /* Randomly-generated build ID */
pciheader:
.ascii "PCIR" /* Signature */
.word pci_vendor_id /* Vendor identification */