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Date: Mon, 16 Sep 2013 18:42:19 -0400
From: Yaniv Sapir <>
To: john-dev <>
Subject: Re: bcrypt-parallella on 64-core (was: Katja's weekly
 report #13)

Please do not read 25 words from 0xf0400. The higher addresses are reserved
and the behaviour is undefined. Highest word in this group is 0xf0448,
which means 19 words.

I will restart the system.

On Mon, Sep 16, 2013 at 4:47 PM, Katja Malvoni <> wrote:

> On Mon, Sep 16, 2013 at 8:20 PM, Yaniv Sapir <> wrote:
>> BTW, the restriction is not just with fetch, but with load in general.
>> The only safe method for a core on this row to read data from ERAM is using
>> eDMA. Writing to ERAM, or writing data from host (or external space in
>> general) onto these cores is no problem.
> This partially explains why test failed. Some cores never read start flag,
> row 3 cores are among them. But not only row 3. Row 7 as well and some
> cores from other rows. After reading start flag, each core should put it to
> zero and wait for new one. In total, 38 cores do not read start flag
> although they should (file cores). In other runs there were 25 (cores2), 23
> and 19 cores which didn't read start flag. First row worked fine except in
> case when 38 cores failed to read start flag and proceed with computation.
> Because of this host is stuck in polling loop.
> I tried reading registers but I don't know what to conclude from them. And
> unfortunately before I copied contents of registers into this email, e-read
> 0 0 0xf0400 25 locked up the system.
> Katja

Yaniv Sapir
Adapteva Inc.
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