Adrian Reber wrote:
On Sat, Jan 10, 2009 at 11:52:56AM -0600, Milton Miller wrote:
Normally such drivers are written and mtd drivers.
If slof were not an of implementation I would just say put the right
properties on the node in the device tree, but the kernel should adapt
to real OF. It should be easy to write a driver to hook up a mtd
platform device if this is a direct mapped flash.
The reason why I did not use mtd is that part of the flash is used by
the firmware image and I do not know if that works with mtd, if only a
part of the flash can be used. SLOF does also a "CRC" check over the
firmware image, so that image must have valid SLOF "CRC". The flash is
a direct mapped flash, but the size of the firmware can vary.
It can. MTD can create "partitions" within the flash, for an example see lines
84-110 of arch/powerpc/bootdts/sbc8641d.dts (http://tinyurl.com/7k2kym)
Partitions can also be labeled as read-only, I guess the CRC could be checked
from userspace as necessary.
HTH,
Martyn
--
Martyn Welch MEng MPhil MIET (Principal Software Engineer) T:+44(0)1327322748
GE Fanuc Intelligent Platforms Ltd, |Registered in England and Wales
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