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Prep for 5.10 release

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git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2928 42af7a65-404d-4744-a932-0658087f49c3
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patacongo
2010-09-08 01:53:23 +00:00
parent a58e77bc9a
commit 60961c2573
1 changed files with 26 additions and 1 deletions
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configs/ea3131/README.txt
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@@ -389,7 +389,32 @@ On-Demand Paging
This example is incomplete in that it does not have any media to reload the This example is incomplete in that it does not have any media to reload the
page text region from: The file configs/ea3131/src/up_fillpage.c is only page text region from: The file configs/ea3131/src/up_fillpage.c is only
a stub. That logic to actually reload the page from some storage medium a stub. That logic to actually reload the page from some storage medium
would have to be implemented in order to complete this example. (among other things) would have to be implemented in order to complete this
example. At present, the example works correctly up to the point where
up_fillpage() is first called and then fails in the expected way.
Here are the detailed list of things that would need to be done in addition
to finishing th up_fillpage() logic (this assumes that SPI NOR FLASH is the
media on which the NuttX image is stored):
1. Develop a NOR FLASH layout can can be used to (1) boot the locked text
section into memory on a reset, and (2) map a virtual fault address
to an offset into paged text section in NOR FLASH.
2. Develop/modify the build logic to build the binaries for this NOR
flash layout: Can the NuttX image be formed as a single image that
is larger than the IRAM? Can we boot from such a large image? If
so, then no special build modifications are required. Or, does the
locked section have to be smaller with a separate paged text section
image in FLASH? In this case, some tool will be needed to break
the nuttx.bin file into the two pieces.
3. Develop a mechanism to load the NuttX image into SPI NOR FLASH. A
basic procedure is already documented in NXP publications: "LPC313x
Linux Quick Start Guide, Version 2.0" and "AN10811 Programming SPI
flash on EA3131 boards, V1 (May 1, 2009)." That procedure may be
sufficient, depending on the decisions made in (1) and (2):
4. Develop a procedure to boot the locked text image from SPI NOR.
The references and issues related to this are discussed in (2)
and (3) above.
ARM/EA3131-specific Configuration Options ARM/EA3131-specific Configuration Options
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^