<p id="en-us_topic_0000001052906247_p1439184741218"><a name="en-us_topic_0000001052906247_p1439184741218"></a><a name="en-us_topic_0000001052906247_p1439184741218"></a>Run this command to set the flash number to 0, and read content that has a size of 0x4800 (9 MB) and a start address of 0x800 (1 MB) to the memory address 0x80000000.</p>
<p id="en-us_topic_0000001052906247_p7391347101215"><a name="en-us_topic_0000001052906247_p7391347101215"></a><a name="en-us_topic_0000001052906247_p7391347101215"></a><strong id="en-us_topic_0000001052906247_b0397473129"><a name="en-us_topic_0000001052906247_b0397473129"></a><a name="en-us_topic_0000001052906247_b0397473129"></a>setenv bootargs "console=ttyAMA0,115200n8 root=emmc fstype=vfat rootaddr=10 M rootsize=15 M rw";</strong></p>
<p id="en-us_topic_0000001052906247_p939547151215"><a name="en-us_topic_0000001052906247_p939547151215"></a><a name="en-us_topic_0000001052906247_p939547151215"></a>Run this command to set the output mode to serial port output, baud rate to <strong id="en-us_topic_0000001052906247_b117741732177"><a name="en-us_topic_0000001052906247_b117741732177"></a><a name="en-us_topic_0000001052906247_b117741732177"></a>115200</strong>, data bit to <strong id="en-us_topic_0000001052906247_b946218717177"><a name="en-us_topic_0000001052906247_b946218717177"></a><a name="en-us_topic_0000001052906247_b946218717177"></a>8</strong>, <strong id="en-us_topic_0000001052906247_b1731025331313"><a name="en-us_topic_0000001052906247_b1731025331313"></a><a name="en-us_topic_0000001052906247_b1731025331313"></a>rootfs</strong> to be mounted to the <strong id="en-us_topic_0000001052906247_b9425113171715"><a name="en-us_topic_0000001052906247_b9425113171715"></a><a name="en-us_topic_0000001052906247_b9425113171715"></a>emmc</strong> component, and file system type to <strong id="en-us_topic_0000001052906247_b1526310519141"><a name="en-us_topic_0000001052906247_b1526310519141"></a><a name="en-us_topic_0000001052906247_b1526310519141"></a>vfat</strong>.</p>
<p id="en-us_topic_0000001052906247_p8402475121"><a name="en-us_topic_0000001052906247_p8402475121"></a><a name="en-us_topic_0000001052906247_p8402475121"></a><strong id="en-us_topic_0000001052906247_b815584925312"><a name="en-us_topic_0000001052906247_b815584925312"></a><a name="en-us_topic_0000001052906247_b815584925312"></a>rootaddr=10 M, rootsize=15 M rw</strong> indicates the start address and size of the rootfs.img file to be burnt, respectively. The file size must be the same as that of the compiled file in the IDE.</p>
<p id="en-us_topic_0000001052906247_p8402475121"><a name="en-us_topic_0000001052906247_p8402475121"></a><a name="en-us_topic_0000001052906247_p8402475121"></a><strong id="en-us_topic_0000001052906247_b815584925312"><a name="en-us_topic_0000001052906247_b815584925312"></a><a name="en-us_topic_0000001052906247_b815584925312"></a>rootaddr=10M, rootsize=15M rw</strong> indicates the start address and size of the rootfs.img file to be burnt, respectively. The file size must be the same as that of the compiled file in the IDE.</p>
<p id="en-us_topic_0000001052906247_p54034712120"><a name="en-us_topic_0000001052906247_p54034712120"></a><a name="en-us_topic_0000001052906247_p54034712120"></a><strong id="en-us_topic_0000001052906247_b2600155013264"><a name="en-us_topic_0000001052906247_b2600155013264"></a><a name="en-us_topic_0000001052906247_b2600155013264"></a>saveenv</strong> means to save the current configuration.</p>
<p id="en-us_topic_0000001052906247_p2401247131212"><a name="en-us_topic_0000001052906247_p2401247131212"></a><a name="en-us_topic_0000001052906247_p2401247131212"></a><strong id="en-us_topic_0000001052906247_b1427444612265"><a name="en-us_topic_0000001052906247_b1427444612265"></a><a name="en-us_topic_0000001052906247_b1427444612265"></a>reset</strong> means to reset the board.</p>
<p id="en-us_topic_0000001052906247_p1440164791213"><a name="en-us_topic_0000001052906247_p1440164791213"></a><a name="en-us_topic_0000001052906247_p1440164791213"></a><strong id="en-us_topic_0000001052906247_b725515390267"><a name="en-us_topic_0000001052906247_b725515390267"></a><a name="en-us_topic_0000001052906247_b725515390267"></a>(Optional) go 0x80000000</strong> indicates that the command is fixed in the startup parameters by default and the board automatically starts after it is reset. If you want to manually start the board, press <strong id="en-us_topic_0000001052906247_b1420714384268"><a name="en-us_topic_0000001052906247_b1420714384268"></a><a name="en-us_topic_0000001052906247_b1420714384268"></a>Enter</strong> in the countdown phase of the U-boot startup to interrupt the automatic startup.</p>
<p id="p1439184741218"><a name="p1439184741218"></a><a name="p1439184741218"></a>Run this command to set the flash number to 0, and read content that has a size of 0x4800 (9 MB) and a start address of 0x800 (1 MB) to the memory address 0x80000000.</p>
<p id="p7391347101215"><a name="p7391347101215"></a><a name="p7391347101215"></a><strong id="b0397473129"><a name="b0397473129"></a><a name="b0397473129"></a>setenv bootargs "console=ttyAMA0,115200n8 root=emmc fstype=vfat rootaddr=10 M rootsize=15 M rw";</strong></p>
<p id="p939547151215"><a name="p939547151215"></a><a name="p939547151215"></a>Run this command to set the output mode to serial port output, baud rate to <strong id="b117741732177"><a name="b117741732177"></a><a name="b117741732177"></a>115200</strong>, data bit to <strong id="b946218717177"><a name="b946218717177"></a><a name="b946218717177"></a>8</strong>, <strong id="b1731025331313"><a name="b1731025331313"></a><a name="b1731025331313"></a>rootfs</strong> to be mounted to the <strong id="b9425113171715"><a name="b9425113171715"></a><a name="b9425113171715"></a>emmc</strong> component, and file system type to <strong id="b1526310519141"><a name="b1526310519141"></a><a name="b1526310519141"></a>vfat</strong>.</p>
<p id="p8402475121"><a name="p8402475121"></a><a name="p8402475121"></a><strong id="b815584925312"><a name="b815584925312"></a><a name="b815584925312"></a>rootaddr=10 M, rootsize=15 M rw</strong> indicates the start address and size of the rootfs.img file to be burnt, respectively. The file size must be the same as that of the compiled file in the IDE.</p>
<p id="p54034712120"><a name="p54034712120"></a><a name="p54034712120"></a><strong id="b2600155013264"><a name="b2600155013264"></a><a name="b2600155013264"></a>saveenv</strong> means to save the current configuration.</p>