[U-Boot] Proposal to add NAND-boot support for Sunxi SPL
r.spliet at ultimaker.com
Fri May 22 09:04:36 CEST 2015
For my set-up I made use of Boris Brezillon's sunxi-nand tree, or
actually I rebased his patches on top of 4.0rc7. This basically adds
support for NAND-chip partitioning, ECC and randomisation. Docs for the
DT specification in Documentation/devicetree/bindings/mtd/sunxi-nand.txt
, and an example can be found in
arch/arm/boot/dts/sun7i-a20-cubietruck.dts .  lists the acceptable
configuration options for the boot and boot_rescue partitions, make sure
to pick one of these (which should be no problem for MLC-type nand). The
ECC mode for these boot partitions is called hw_syndrome.
Assuming you now have a Linux set-up kernel based on this tree with NAND
support on an MMC, for U-boot what you should currently do is:
1) in include/configs/sunxi-common.h, adjust the parameters
<CONFIG_NAND_SUNXI_>PAGE_SIZE, ECC_STEP, ECC_STRENGTH to match your NAND
chip and DT configuration.
3) Use your MMC to flash u-boot-sunxi-with-spl.bin onto NAND:
# flash_erase /dev/mtd0
# nandwrite -p /dev/mtd0 u-boot-sunxi-with-spl.bin
4) Reboot without the MMC card and see U-boot load
That should be all.
@Alex: To answer your question specifically: It's likely that the
parameters in sunxi-common.h mentioned above might not match your
NAND-chip configuration in the Linux kernel. I can't tell you precisely
how to fetch these details from the 3.4 kernel, sorry. I recall Daniel
using 24-bit strength ECC with otherwise equal parameters, but perhaps
he can help you with this better than I can.
Op 22-05-15 om 04:23 schreef kaplan2539 at gmail.com:
> Hi Roy,
> I could definitely use such a howto. I have applied the patches to the
> current mainline u-boot head and try to boot my A13-OlinXino Wifi
> board in FEL mode.
> I can compile and boot into u-boot via FEL. However, I get these
> errors when I have CONFIG_SPL_NAND_SUPPORT defined:
> U-Boot SPL 2015.07-rc1-00276-g77792f9-dirty (May 21 2015 - 19:15:54)
> DRAM: 512 MiB
> Failed to set core voltage! Can't set CPU frequency
> sunxi board_nand_init()
> Nand initialised
> Error: 1 ECC failures detected
> Error: 512 ECC failures detected
> This is my configs/A13-OLinuXino_defconfig looks like this:
> # For use with the Olimex 7" LCD module, adjust timings for other
> # Set video-mode=sunxi:800x600-24 at 60,monitor=lcd in the env. to enable
> I just found out in the sun5i-a13-olinuxino.dts file are no nand settings.
> I guess I can find the information in the linux-sunxi 3.4 kernels fex
> file for the olinuxio and need to convert to dts, correct?
> I am happy about any hints / comments.
> On Thursday, May 21, 2015 at 11:08:24 AM UTC-7, Hans de Goede wrote:
> Hi Roy,
> On 21-05-15 15:59, Roy Spliet wrote:
> > The following patches take the work by Daniel Kochmánski, and
> make some
> > heavy modifications for readability and functionality, based on
> > Brezillon's Linux driver. Tested on an Olimex Lime w/ A20.
> > Patches are sent as RFC. Open questions:
> > - Config options added are partially NAND-chip specific. Some
> options can
> > be autodetected based on the NAND ID, others require either
> > or config options like these. Do they belong in sunxi-common?
> > we make a Kconfig option for this? If bikeshedding is desired,
> are defines
> > in sunxi-common.h good enough for now?
> > - Style is mostly kernel-like. Satisfied?
> > - Daniel: do you think we can work from here?
> > Please comment away!
> Cool stuff. Overall this looks good I'll reply with more detailed
> to your individual patches, 2 questions:
> 1) Can you provide a quick howto (at developer level) on how to
> get the spl and u-boot into the nand, what I'm looking for is
> like this:
> a) Take this git repo + branch, build a kernel from it
> b) Look at this dts file for a nand settings example, adjust it
> for your board
> c) Once booted into the kernel using an updated dts you should
> have these
> block devices, dd spl to this one, and u-boot to this one.
> No more to go more detailed then that :)
> 2) What is the plan to add support for loading files from nand in
> u-boot proper,
> so that we can get (e.g.) extlinux.conf + kernel +dtb from a /boot
> on nand ?
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