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On 3/1/11 5:47 PM, zxy__1127 wrote:
<blockquote cite="mid:201103020947121258043@163.com%20" type="cite">
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<div><font face="Verdana" size="2"><font color="#808080"><strong>发
件人：</strong> Keith Hui </font></font></div>
<div><font face="Verdana" size="2"><font color="#808080"><strong>发
送时间：</strong> 2011-03-02 00:32:50 </font></font></div>
<div><font face="Verdana" size="2"><font color="#808080"><strong>收
件人：</strong> <a class="moz-txt-link-abbreviated" href="mailto:coreboot@coreboot.org">coreboot@coreboot.org</a> </font></font></div>
<div><font face="Verdana" size="2"><font color="#808080"><strong>抄
送：</strong> </font></font></div>
<div><font face="Verdana" size="2"><font color="#808080"><strong>主
题：</strong> Re: [coreboot] how to deal with large romstage
size? </font></font></div>
<div><font color="#808080"> </font></div>
<div><font face="Verdana" size="2">
<div><font color="#808080">> Hi all,</font></div>
<div><font color="#808080">></font></div>
<div><font color="#808080">> After I add some memory initialisize code, the romstage is over 64K byte,and tne code can't run properly.</font></div>
<div><font color="#808080">> Then what should I do when romstage is over 64K byte? Is romstage's size limits to 64KB?</font></div>
<div><font color="#808080">></font></div>
<div><font color="#808080">> Thanks a lot!</font></div>
<div><font color="#808080">> 2011-03-01</font></div>
<div><font color="#808080">></font></div>
<div> </div>
<div><font color="#808080">It is not a direct limitation on romstage's size, but a result of most</font></div>
<div><font color="#808080">chipsets mapping only the top 64KB of flash to the memory space. Most</font></div>
<div><font color="#808080">chipsets require some programming to have the entire flash rom appear</font></div>
<div><font color="#808080">in memory. Your code didn't run properly because not all of it has</font></div>
<div><font color="#808080">been mapped to memory space and get effectively cut.</font></div>
<div> </div>
<div><font color="#808080">But my romstage for Intel 440BX is only about 11KB. What chipset are</font></div>
<div><font color="#808080">you dealing with?</font></div>
<div> </div>
<div><font color="#0000ff" size="3">my chipset is intel
arrandal+qm57,it's MRC code is very large(about 110KB
after build) :-(</font></div>
<div> </div>
<div><font color="#808080">Also, look at implementing TINY_BOOTBLOCK which leaves a tiny stub,</font></div>
<div><font color="#808080">well within the 64KB limit, which does nothing but enable enough</font></div>
<div><font color="#808080">hardware (southbridge to be exact) to make the entire rom visible,</font></div>
<div><font color="#808080">then locates and executes the real romstage which is now just another</font></div>
<div><font color="#808080">stage in CBFS. Again, all 440BX/PIIX4 boards implement this and can be</font></div>
<div><font color="#808080">a reference.</font></div>
<div> </div>
<div><strong><span class="Apple-style-span"
style="word-spacing: 0px; font: medium 'Times New
Roman'; text-transform: none; color: rgb(0, 0, 0);
text-indent: 0px; white-space: normal; letter-spacing:
normal; border-collapse: separate; orphans: 2; widows:
2;"><span class="Apple-style-span" style="font-size:
small; line-height: 18px; font-family: arial;"><font
color="#0000ff">actually, </font></span></span><span
class="Apple-style-span" style="word-spacing: 0px; font:
medium 'Times New Roman'; text-transform: none; color:
rgb(0, 0, 0); text-indent: 0px; white-space: normal;
letter-spacing: normal; border-collapse: separate;
orphans: 2; widows: 2;"><span class="Apple-style-span"
style="font-size: small; line-height: 18px;
font-family: arial;"><font color="#0000ff">it can run
at bootblock,but can not reach "cache_as_ram:".</font></span></span></strong></div>
<div><font color="#808080"><span class="Apple-style-span"
style="word-spacing: 0px; font: medium 'Times New
Roman'; text-transform: none; color: rgb(0, 0, 0);
text-indent: 0px; white-space: normal; letter-spacing:
normal; border-collapse: separate; orphans: 2; widows:
2;"><span class="Apple-style-span" style="font-size:
small; line-height: 18px; font-family: arial;"></span></span></font><font
size="3"><font color="#0000ff"></font></font><br>
</div>
</font></div>
</blockquote>
<br>
I think you need to make the complete flash visible in a southbridge
bootblock.c<br>
<br>
It would help if you could publish your current code so we can do
better than asking the crystal ball for answers ;)<br>
<br>
Stefan<br>
<br>
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