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(-)
--
1.7.10.4
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