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<section id="skiboot-5-4-5">
<span id="id1"></span><h1>skiboot-5.4.5<a class="headerlink" href="#skiboot-5-4-5" title="Permalink to this headline">¶</a></h1>
<p>skiboot-5.4.5 was released on Friday June 9th, 2017. It replaces
<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> as the current stable release in the 5.4.x series.</p>
<p>Over <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>, we have a small number of bug fixes:</p>
<ul>
<li><p>On FSP platforms: notify FSP of Platform Log ID after Host Initiated Reset Reload
Trigging a Host Initiated Reset (when the host detects the FSP has gone
out to lunch and should be rebooted), would cause “Unknown Command” messages
to appear in the OPAL log.</p>
<p>This patch implements those messages.</p>
<p>Log showing unknown command:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">/</span> <span class="c1"># cat /sys/firmware/opal/msglog | grep -i ,3</span>
<span class="p">[</span> <span class="mf">110.232114723</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span> <span class="n">FSP</span><span class="p">:</span> <span class="n">fsp_trigger_reset</span><span class="p">()</span> <span class="n">entry</span>
<span class="p">[</span> <span class="mf">188.431793837</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span> <span class="n">FSP</span> <span class="c1">#0: Link down, starting R&R</span>
<span class="p">[</span> <span class="mf">464.109239162</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span> <span class="n">FSP</span> <span class="c1">#0: Got XUP with no pending message !</span>
<span class="p">[</span> <span class="mf">466.340598554</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span> <span class="n">FSP</span><span class="o">-</span><span class="n">DPO</span><span class="p">:</span> <span class="n">Unknown</span> <span class="n">command</span> <span class="mh">0xce0900</span>
<span class="p">[</span> <span class="mf">466.340600126</span><span class="p">,</span><span class="mi">3</span><span class="p">]</span> <span class="n">FSP</span><span class="p">:</span> <span class="n">Unhandled</span> <span class="n">message</span> <span class="n">ce0900</span>
</pre></div>
</div>
</li>
<li><p>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>head.S: store all of LR and CTR</p>
<p>When saving the CTR and LR registers the skiboot exception handlers use the
‘stw’ instruction which only saves the lower 32 bits of the register. Given
these are both 64 bit registers this leads to some strange register dumps,
for example:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span>***********************************************
Unexpected exception 200 !
SRR0 : 0000000030016968 SRR1 : 9000000000201000
HSRR0: 0000000000000180 HSRR1: 9000000000001000
LR : 3003438830823f50 CTR : 3003438800000018
CFAR : 00000000300168fc
CR : 40004208 XER: 00000000
</pre></div>
</div>
<p>In this dump the upper 32 bits of LR and CTR are actually stack gunk
which obscures the underlying issue.</p>
</li>
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