Installing to NAND: Difference between revisions
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==Procedure== |
==Procedure== |
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After the board has booted, hit ctrl |
After the board has booted, hit ctrl alt F1 to get to a login prompt, and login as root. Then: |
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modprobe mtdchar |
modprobe mtdchar |
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=== I see a hang after "<tt>NOTICE: Booting default</tt>" === |
=== I see a hang after "<tt>NOTICE: Booting default</tt>" === |
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This is normal: the filesystem on the NAND flash is being uncompressed. It should last for around 80 seconds. (Yes, this is slow! The Geode's flash-memory controller performance is very slow. On future boards |
This is normal: the filesystem on the NAND flash is being uncompressed. It should last for around 80 seconds. (Yes, this is slow! The Geode's flash-memory controller performance is very slow. On future boards |
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=== <tt>JFFS2 warning: (1381) jffs2_sum_write sumnode: Not enough space for summary, padsize = -793</tt> === |
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This warning is harmless. |
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=== <tt>Skipping bad block at 0xnnnn0000</tt> === |
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During flash_eraseall, this is normal. See procedure section above. |
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== Timing == |
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* '''Flash_eraseall''' takes roughly 14 seconds, |
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* '''Nandwrite'''andwrite takes roughly 54 seconds when the input file is taken from a USB 2.0 key. |
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[[Category:Developers]] |
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Revision as of 06:02, 18 April 2007
Auto Installer
The data in this page is a bit outdated. There are better methods now. Please see Autoreinstallation image
Overview
Please try installing to NAND flash now, and report any difficulties.
This page describes how to write a filesystem to the board's internal NAND flash and boot from it using LinuxBIOS.
Requirements
You should have a working install of one of the OLPC Build images, build 79 or higher, and a copy of the corresponding jffs2.img for that build available. (For example, on another USB key, or on another partition of the same key if it is larger than 512M.)
Procedure
After the board has booted, hit ctrl alt F1 to get to a login prompt, and login as root. Then:
modprobe mtdchar flash_eraseall -j /dev/mtd0 nandwrite -p /dev/mtd0 /path/to/olpc-development-rpm-jffs2.img
We intend to provide a mechanism to let the jffs2 img be streamed to nandwrite over the network, for people with only one USB key; this isn't working currently, though.
It is normal to see bad block errors during both the flash_eraseall; NAND flash comes from the factory with bad blocks marked. You may also see error messages during the nandwrite step. When the nandwrite has finished you can reboot, and LinuxBIOS will boot from the NAND flash.
Troubleshooting
flash_eraseall: /dev/mtd0: No such file or directory
This is seen when modprobe mtdchar wasn't performed.
NOTE: You'll get the very same error if you don't Upgrade to LinuxBIOS first.
I see a hang after "NOTICE: Booting default"
This is normal: the filesystem on the NAND flash is being uncompressed. It should last for around 80 seconds. (Yes, this is slow! The Geode's flash-memory controller performance is very slow. On future boards