<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Malgun Gothic";
panose-1:2 11 5 3 2 0 0 2 0 4;}
@font-face
{font-family:"Malgun Gothic";
panose-1:2 11 5 3 2 0 0 2 0 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
text-align:justify;
text-justify:inter-ideograph;
text-autospace:none;
word-break:break-hangul;
font-size:10.0pt;
font-family:"Malgun Gothic";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:#0563C1;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:#954F72;
text-decoration:underline;}
p.msonormal0, li.msonormal0, div.msonormal0
{mso-style-name:msonormal;
mso-margin-top-alt:auto;
margin-right:0cm;
mso-margin-bottom-alt:auto;
margin-left:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal;
font-family:"Malgun Gothic";
color:windowtext;}
span.EmailStyle19
{mso-style-type:personal-reply;
font-family:"Malgun Gothic";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:3.0cm 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=KO link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hello,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>For anyone’s help..<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I asked this question to unix stackexchage and received an answer.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><a href="https://unix.stackexchange.com/questions/674155/what-does-loadaddr-0x20008000-mean-in-linux-kernel-make-command">https://unix.stackexchange.com/questions/674155/what-does-loadaddr-0x20008000-mean-in-linux-kernel-make-command</a> <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Chan Kim<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal align=left style='text-align:left;text-autospace:ideograph-numeric ideograph-other;word-break:keep-all'><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> Chan Kim <ckim@etri.re.kr> <br><b>Sent:</b> Thursday, October 21, 2021 3:00 PM<br><b>To:</b> kernelnewbies@kernelnewbies.org<br><b>Subject:</b> What does LOADADDR=0x20008000 mean in linux kernel make command? and what is kernel load address?<o:p></o:p></span></p></div></div><p class=MsoNormal align=left style='text-align:left'><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Hello all,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>I'm learning u-boot these days and have a question.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Using qemu model, I could (using qemu) load the </span>“<span lang=EN-US>Image</span>”<span lang=EN-US> (for arm64) on memory location I want and I could run the kernel booting using `booti ker_add initrd_addr dtb_addr` command. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>As you know in arm64, the uImage format is not supported.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Then, when building linux kernel for arm (32 bit) using u-boot, what does </span>“<span lang=EN-US>make LOADADDR=0x20008000 uImage</span>”<span lang=EN-US> mean? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Regardless of this LOADADDR, we can load (from SD card or network) the uImage anywhere we want using u-boot shell. Then what is this LOADADDR?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Does it mean that when we run `bootm` command, the u-boot program relocates the kernel image inside the uImage to 0x20008000? <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>(and the kernel built not using position independent, PC-relative addressing..using hard absolute addresses..)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Some years ago, we used kernel start address during the build and I had to load the kernel image exactly on that address. But this time I could load </span>‘<span lang=EN-US>Image</span>’<span lang=EN-US> anywhere I want and could run it. Why?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Is it because I (not knowingly) compiled the arm64 </span>‘<span lang=EN-US>Image</span>’<span lang=EN-US> using position independent address(-PIE option)?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>If someone with expertise could explain to me what</span>’<span lang=EN-US>s happening here, I would really really appreciate it. <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Thank you.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Best regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>Chan Kim<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p></div></div></body></html>