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How to decrease the delay to flush write buffer

DISCUSSION Peter Menzebach 2 participants 2 messages Nov 21, 2005 Memory technology devices (MTD)

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Peter Menzebach

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#0 lore raw

Hi,
I am using jffs2 on Atmel dataflash. I encounter sometimes errors like "Empty flash at 0x004a7814 ends at 0x004a79c0" and "read_dnode: header CRC failed on node at 0x63d670: read 0xffffffff, calculated 0x8f83d3bc". My guess at the moment is, that this happens at unclean reboots (power off), where the write buffer is not flushed. For dataflash CONFIG_JFFS2_FS_WRITEBUFFER is mandatory.

For my purpose this would be avoided more or less completely, if the write buffer would be flushed after a delay of some 100 ms instead of some seconds. How can I reduce this timer?

Best regards
Peter

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Peter Menzebach
Menzebach und Wolff IT-Consulting GbR
Phone +49 751 355 387 1
#1 lore raw
Quoted 11 lines · Peter Menzebach

Hi,
I am using jffs2 on Atmel dataflash. I encounter sometimes errors like "Empty flash at 0x004a7814 ends at 0x004a79c0" and "read_dnode: header CRC failed on node at 0x63d670: read 0xffffffff, calculated 0x8f83d3bc". My guess at the moment is, that this happens at unclean reboots (power off), where the write buffer is not flushed. For dataflash CONFIG_JFFS2_FS_WRITEBUFFER is mandatory.

For my purpose this would be avoided more or less completely, if the write buffer would be flushed after a delay of some 100 ms instead of some seconds. How can I reduce this timer?

http://linux-mtd.infradead.org/faq/jffs2.html

Read "How is ensured, that data is written to flash ?"

josh