[U-Boot-Users] multicast tftp: RFC2090

[David Updegraff]

Here is a first pass; not yet request for merge.

Only have been able to test with 8343 TSEC and an old SC520-based
rtl8139 so far, and with only two concurrent downloads; against atftpd
server. Re-cycling the existing ext2 bitmap functions to do housekeeping.

In about a month I should have access to enough hardware to test 20+
concurrent tftpboots.

Suggestions & comments appreciated.

thnx.
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