2009-03-13 15:24:44 M25P80 driver - not identifying device correctly

Tim Shearer (UNITED STATES)

Message: 70968

Hi community,

This issue relates to the device initialisation of an SPI flash IC.

I'm using a cm-bf537e board, hooked up to a Spansion S25FL064A flash chip (SPI), using chip select 1. I have a recent uClinux from trunk (svn 7843). The kernel and board/platform data are configured as per the wiki:

http://docs.blackfin.uclinux.org/doku.php?id=hw:cards:spi_flash

At boot time, my device isn't recognised:

m25p80 spi0.1: found m25p80, expected s25sl064a

I had this working correctly on 2008R1.5.

Incidentally, I disabled SPI/MMC to eliminate any possible conflicts.

This warning displayed is misleading, since a check with a scope reveals that chip select 1 isn't being toggled at any point during the boot process. I did, however, manage to get the chip select line to operate, but only by changing the mode to SPI_MODE_0. But the device still wasn't recognised. Incidentally, I have pull-ups on MOSI, MISO, and SCK, but not the chip select.

My kernel configs follow (I included support for CFI/JEDEC flash devices):

--- Memory Technology Device (MTD) support

│ │ [*] MTD partitioning support

│ │ [*] Command line partition table parsing

│ │ < > TI AR7 partitioning support

│ │ <*> Direct char device access to MTD devices

│ │ -*- Common interface to block layer for MTD 'translation layers'

│ │ <*> Caching block device access to MTD devices

│ │ RAM/ROM/Flash chip drivers --->

> <*> Detect flash chips by Common Flash Interface (CFI) probe

> <*> Detect non-CFI AMD/JEDEC-compatible flash chips

> [*] Flash chip driver advanced configuration options

> Flash cmd/query data swapping (NO) --->

> [*] Specific CFI Flash geometry selection

> [*] Support 8-bit buswidth

> [*] Support 16-bit buswidth

> [*] Support 32-bit buswidth

> [*] Support 1-chip flash interleave

> [*] Support 2-chip flash interleave

> <*> Support for Intel/Sharp flash chips

> <*> Support for AMD/Fujitsu/Spansion flash chips

> <*> Support for ST (Advanced Architecture) flash chips

> <*> Support for RAM chips in bus mapping

> <*> Support for absent chips in bus mapping

│ │ Mapping drivers for chip access --->

> [ ] Support non-linear mappings of flash chips

> <M> CFI Flash device in physical memory map

> (0x0) Physical start address of flash mapping

> (0x000) Physical length of flash mapping

> (2) Bank width in octets

> <*> Generic uClinux RAM/ROM filesystem support

> < > Map driver for platform device RAM (mtd-ram)

│ │ Self-contained MTD device drivers --->

> < > Support for AT45xxx DataFlash

> <*> Support most SPI Flash chips (AT26DF, M25P, W25X, ...)

> [*] Use FAST_READ OPCode allowing SPI CLK <= 50MHz

--- SPI support

│ │ *** SPI Master Controller Drivers ***

│ │ <*> SPI controller driver for ADI Blackfin5xx

It seems that the m25p driver isn't talking to the SPI framework properly, but if that's the case then I'm surprised no-one else on the forum has encountered this.

Any thoughts appreciated.

Thanks,

Tim

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2009-03-14 20:29:28 Re: M25P80 driver - not identifying device correctly

Robin Getz (UNITED STATES)

Message: 70988

Tim:

I don't have a SPI flash card on me - or I would test it out. - someone will have a look on Monday.

-Robin

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2009-03-16 06:26:46 Re: M25P80 driver - not identifying device correctly