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OMAP: Boot from UBI

Christoph Fritz barebox 1 version In review

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  1. v1 Latest2 patches 2 repliesIn review

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#Subject and filesSizeRepliesApplied
1/2ARM OMAP: MLO: add support for loading Barebox from UBIarch/arm/mach-omap/Kconfig arch/arm/mach-omap/xload.c+118 -21 reply
2/2ARM OMAP: add support for loading Environment from UBIcommon/Kconfig common/startup.c+51 -01 reply

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Cover letter [PATCH 0/2] OMAP: Boot from UBI

This small set of patches adds boot from UBI support on OMAP SoCs:
MLO attaches UBI, loads barebox from within a static volume and goes up from there.
The benefit: NAND wearleveling is also done for barebox.

A NAND layout can now look like this:

       +------------+-->0x00000000-> xload start   (MLO copy on 1st block)
       |            |
       |            |-->0x0001FFFF-> xload end
       |            |-->0x00020000-> xload1 start   (MLO backup copy on 2rd)
       |            |
       |            |-->0x0003FFFF-> xload1 end
       |            |-->0x00040000-> xload2 start   (MLO backup copy on 3rd)
       |            |
       |            |-->0x0005FFFF-> xload2 end
       |            |-->0x00060000-> xload3 start   (MLO backup copy on 4rd)
       |            |
       |            |-->0x0007FFFF-> xload3 end
       |            |-->0x00080000-> ubi start
       |            |
       |            |
       |            |     UBI-Volumes:
       |            |           - barebox_0 [1M]
       |            |           - bareboxenv_0 [512k]
       |            |           - kernel_0 [6M]
       |            |           - oftree_0 [512k]
       |            |           - bmp_0 [2M]
       |            |           - root [-]
       |            |
       |            |
       +------------+-->0x0FFFFFFF-> root end

Next step (ToDo) is to decrease boot-time because it takes nearly six secounds to get to a fully featured barebox-prompt. Possible solutions are:

- use UBI Fastmap to decrease scan time
- only scan UBI once and transfer gained data to next boot stage:
MLO (scans UBI) -> Barebox (gets data) -> Kernel (gets data)

---
Christoph Fritz (2):
ARM OMAP: MLO: add support for loading Barebox from UBI ARM OMAP: add support for loading Environment from UBI

 arch/arm/mach-omap/Kconfig |   44 +++++++++++++++++++++++++
 arch/arm/mach-omap/xload.c |   76 ++++++++++++++++++++++++++++++++++++++++++--
 common/Kconfig             |   34 ++++++++++++++++++++
 common/startup.c           |   17 ++++++++++
 4 files changed, 169 insertions(+), 2 deletions(-)
Signature · 8 lines
1.7.10.4



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Read the cover letter in its thread