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<div class="section" id="skiboot-5-6-0-rc2">
<span id="id1"></span><h1>skiboot-5.6.0-rc2<a class="headerlink" href="#skiboot-5-6-0-rc2" title="Permalink to this headline">¶</a></h1>
<p>skiboot-5.6.0-rc2 was released on Friday May 19th 2017. It is the second
release candidate of skiboot 5.6, which will become the new stable release
of skiboot following the 5.5 release, first released April 7th 2017.</p>
<p>skiboot-5.6.0-rc2 contains all bug fixes as of <a class="reference internal" href="skiboot-5.4.4.html#skiboot-5-4-4"><span class="std std-ref">skiboot-5.4.4</span></a>
and <a class="reference internal" href="skiboot-5.1.19.html#skiboot-5-1-19"><span class="std std-ref">skiboot-5.1.19</span></a> (the currently maintained stable releases). We
do not currently expect to do any 5.5.x stable releases.</p>
<p>For how the skiboot stable releases work, see <a class="reference internal" href="../process/stable-skiboot-rules.html#stable-rules"><span class="std std-ref">Skiboot stable tree rules and releases</span></a> for details.</p>
<p>The current plan is to cut the final 5.6.0 by May 22nd, with skiboot 5.6.0
being for all POWER8 and POWER9 platforms in op-build v1.17 (Due May 24th).
This is a short cycle as this release is mainly targetted towards POWER9
bringup efforts.</p>
<p>With skiboot 5.6.0, we are moving to a regular six week release cycle,
similar to op-build, but slightly offset to allow for a short stabilisation
period. Expected release dates and contents are tracked using GitHub milestone
and issues: <a class="reference external" href="https://github.com/open-power/skiboot/milestones">https://github.com/open-power/skiboot/milestones</a></p>
<p>Over <a class="reference internal" href="skiboot-5.6.0-rc1.html#skiboot-5-6-0-rc1"><span class="std std-ref">skiboot-5.6.0-rc1</span></a>, we have the following changes:</p>
<ul>
<li><p class="first">hw/i2c: Fix early lock drop</p>
<p>When interacting with an I2C master the p8-i2c driver (common to p9)
aquires a per-master lock which it holds for the duration of it’s
interaction with the master. Unfortunately, when
p8_i2c_check_initial_status() detects that the master is busy with
another transaction it drops the lock and returns OPAL_BUSY. This is
contrary to the driver’s locking strategy which requires that the
caller aquire and drop the lock. This leads to a crash due to the
double unlock(), which skiboot treats as fatal.</p>
</li>
<li><p class="first">mambo: Add skiboot/linux symbol lookup</p>
<p>Adds the skisym and linsym commands which can be used to find the
address of a Linux or Skiboot symbol. To function this requires
the user to provide the SKIBOOT_MAP and VMLINUX_MAP environmental
variables which indicate which skiboot.map and System.map files
should be used.</p>
<p>Examples:</p>
<ul>
<li><p class="first">Look up a symbol address:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">systemsim</span> <span class="o">%</span> <span class="n">skisym</span> <span class="o">.</span><span class="n">load_and_boot_kernel</span>
<span class="mh">0x0000000030013a08</span>
</pre></div>
</div>
</li>
<li><p class="first">Set a breakpoint there:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">systemsim</span> <span class="o">%</span> <span class="n">b</span> <span class="p">[</span><span class="n">skisym</span> <span class="o">.</span><span class="n">load_and_boot_kernel</span><span class="p">]</span>
<span class="n">breakpoint</span> <span class="nb">set</span> <span class="n">at</span> <span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="mi">0</span><span class="p">]:</span> <span class="mh">0x0000000030013a08</span> <span class="p">(</span><span class="mh">0x0000000030013A08</span><span class="p">)</span> <span class="n">Enc</span><span class="p">:</span><span class="mh">0x7D800026</span> <span class="p">:</span> <span class="n">mfcr</span> <span class="n">r12</span>
</pre></div>
</div>
</li>
</ul>
</li>
<li><p class="first">libstb: Fix build in OpenSSL 1.1</p>
<p>The build failure was as follows:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>[ HOSTCC ] libstb/create-container.c
In file included from /usr/include/openssl/asn1.h:24:0,
from /usr/include/openssl/ec.h:30,
from libstb/create-container.c:36:
libstb/create-container.c: In function ‘getSigRaw’:
libstb/create-container.c:104:31: error: dereferencing pointer to incomplete
type ‘ECDSA_SIG {aka struct ECDSA_SIG_st}’
rlen = BN_num_bytes(signature->r);
^
</pre></div>
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