📄 accessing_serial_nor_flash_with_u-boot.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head> <title></title> <link rel="stylesheet" media="screen" type="text/css" href="./style.css" /> <link rel="stylesheet" media="screen" type="text/css" href="./design.css" /> <link rel="stylesheet" media="print" type="text/css" href="./print.css" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><a href=start.html>start</a></br><div class="toc"><div class="tocheader toctoggle" id="toc__header">Table of Contents</div><div id="toc__inside"><ul class="toc"><li class="clear"><ul class="toc"><li class="level2"><div class="li"><span class="li"><a href="#serial_nor_flash" class="toc">Serial NOR Flash</a></span></div></li><li class="level2"><div class="li"><span class="li"><a href="#using_eeprom_command" class="toc">Using eeprom command</a></span></div><ul class="toc"><li class="level3"><div class="li"><span class="li"><a href="#write_uclinux_kernel_to_serial_flash_and_boot_linux" class="toc">Write uClinux kernel to serial flash and boot linux</a></span></div></li></ul></li></ul></li></ul></div></div><h2><a name="serial_nor_flash" id="serial_nor_flash">Serial NOR Flash</a></h2><div class="level2"><p>U-boot supports Serial NOR Flash - a four-wire SPI-compatible interface as used for serial EEPROM which provides a sequential read access. They offer densities up to 8Mbytes.<a href="http://www.st.com/stonline/products/families/memories/fl_ser/sf_code.htm" class="urlextern" title="http://www.st.com/stonline/products/families/memories/fl_ser/sf_code.htm" rel="nofollow">ST Flash</a> has been validated with uClinux/Blackfin, and drivers are avalible.</p><p>You can <a href="compiling_u-boot.html#build_u-boot_to_boot_from_serial_flash" class="wikilink1" title="compiling_u-boot.html">build U-boot</a> to boot from Serial NOR Flash, and you can also read and write the serial flash using U-Boot command <code>eeprom</code>. </p></div><!-- SECTION [1-553] --><h2><a name="using_eeprom_command" id="using_eeprom_command">Using eeprom command</a></h2><div class="level2"></div><!-- SECTION [554-586] --><h3><a name="write_uclinux_kernel_to_serial_flash_and_boot_linux" id="write_uclinux_kernel_to_serial_flash_and_boot_linux">Write uClinux kernel to serial flash and boot linux</a></h3><div class="level3"><p>Firstly tftp download a file to one memory address (e.g., <code>0×1000000</code>), then use <code>eeprom write</code> command to copy the file to the SPI flash address(For example, <code>0×100000</code>).</p><pre class="code"> stamp> tftp 0x1000000 uImagestamp> eeprom write 0x1000000 0x100000 $(filesize)</pre><p> When done, use <code>eeprom read</code> command to copy it out to another memory address, e.g, 0×2000000. Then use <code>cmp.b</code> command to compare if the data at these two addresses are identical. Finally <code>bootm</code> the kernel that is copied from SPI flash. The commands are: </p><pre class="code">stamp> eeprom read 0x2000000 0x100000 $(filesize)stamp> cmp.b 0x1000000 0x2000000 $(filesize)stamp> bootm 0x2000000</pre><p> <code>eeprom</code><a href="compiling_u-boot.html" class="wikilink1" title="compiling_u-boot.html">compiling_u-boot</a></p><p>The page <a href="enabling_jffs2.html" class="wikilink1" title="enabling_jffs2.html">enabling_jffs2</a> shows details on how to write kernel image and JFFS2 file system image to serial NOR flash, and enable kernel to access serial NOR flash.</p></div><!-- SECTION [587-] --></body></html>⌨️ 快捷键说明
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