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Problems with Antminer U1 – why doesn’t it work?

I’ve got other Antminers working, this one just throws these errors in debug mode – is this fixable?

[2014-01-30 19:03:10] Bmsc send golden nonce [2014-01-30 19:03:10] ANT0: GetResults (amt=0 err=-7 ern=110) [2014-01-30 19:03:10] Bmsc Read: No data for 101 ms [2014-01-30 19:03:10] Bmsc recv golden nonce timeout [2014-01-30 19:03:10] USB uninit ANT0 [2014-01-30 19:03:10] USB free ANT [2014-01-30 19:03:10] USB unlock Bitmain 1-5 [2014-01-30 19:03:10] RES: Bitmain (1:5) lock=0 [2014-01-30 19:03:10] USB res unlock Bitmain 1-5 [2014-01-30 19:03:10] BTM looking for ANT 10c4:ea60 but found 0e0f:0003 instead [2014-01-30 19:03:10] BTM looking for ANT 10c4:ea60 but found 0e0f:0002 instead [2014-01-30 19:03:10] BTM looking for ANT 10c4:ea60 but found 1d6b:0002 instead 

I’m running cgminer 3.9.0 from the fractal branch, though all the versions that support the antminer-u1 seem to have the same results, so I don’t think it’s necessarily the miner software. I’m running with these options to underclock:

--bmsc-options 115200:20  --bmsc-freq 0681 -D 

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Reducing a lattice basis with too many basis vectors

Suppose I have a basis $B$ of an $n$-dimensional lattice $Lsubseteqmathbb{Z}^n$ and $B$ has $n$ vectors. Now I take another $vin mathbb{Z}^nsetminus L$ and I define a new lattice $L’=L+mathbb{Z}v$. The set of vectors $B’:=Bcup{v}$ generates $L’$, but since $L’$ is $n$-dimensional, it’s rank is at most $n$, so $B’$ is too big. So there::Listen

Suppose I have a basis $B$ of an $n$-dimensional lattice $Lsubseteqmathbb{Z}^n$ and $B$ has $n$ vectors. Now I take another $vin mathbb{Z}^nsetminus L$ and I define a new lattice $L’=L+mathbb{Z}v$. The set of vectors $B’:=Bcup{v}$ generates $L’$, but since $L’$ is $n$-dimensional, it’s rank is at most $n$, so $B’$ is too big. So there must be some other basis that generates $L’$. How do we produce that from $B’$?

I vaguely recall reading that LLL could do this, but I have no idea how. Can anyone point to reference or give a quick argument/proof?

Problems with Antminer U1 – why doesn’t it work?

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