Hello,
For my set-up I made use of Boris Brezillon's sunxi-nand tree[1], 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 . [2] 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.
2) Build
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.
Cheers,
Roy
[1] https://github.com/bbrezillon/linux-sunxi/commits/sunxi-nand
[2] https://linux-sunxi.org/NAND#More_information_on_BROM_NAND
Op 22-05-15 om 04:23 schreef kaplan2...@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:
CONFIG_SYS_EXTRA_OPTIONS="CONS_INDEX=2,AXP209_POWER,USB_EHCI,SYS_MAX_NAND_DEVICE=1,SYS_NAND_BASE=0x00"
CONFIG_NAND=y
CONFIG_SUNXI_NAND=y
CONFIG_SUNXI_DMA=y
CONFIG_CMD_NAND=y
CONFIG_SPL_NAND_SUPPORT=y
CONFIG_SPL=y
CONFIG_FDTFILE="sun5i-a13-olinuxino.dtb"
CONFIG_USB1_VBUS_PIN="PG11"
CONFIG_VIDEO_HDMI=n
CONFIG_VIDEO_VGA_VIA_LCD=y
CONFIG_VIDEO_VGA_VIA_LCD_FORCE_SYNC_ACTIVE_HIGH=y
# For use with the Olimex 7" LCD module, adjust timings for other
displays
# Set video-mode=sunxi:800x600-24@60,monitor=lcd in the env. to enable
CONFIG_VIDEO_LCD_MODE="x:800,y:480,depth:18,pclk_khz:33000,le:16,ri:209,up:22,lo:22,hs:30,vs:1,sync:3,vmode:0"
CONFIG_VIDEO_LCD_POWER="AXP0-0"
CONFIG_VIDEO_LCD_BL_PWM="PB2"
CONFIG_ARM=y
CONFIG_ARCH_SUNXI=y
CONFIG_MACH_SUN5I=y
CONFIG_DRAM_CLK=408
CONFIG_DRAM_ZQ=123
CONFIG_DRAM_EMR1=0
CONFIG_DEFAULT_DEVICE_TREE="sun5i-a13-olinuxino"
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.
Thanks
Alex
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
Boris
> 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
brute-forcing
> or config options like these. Do they belong in sunxi-common?
Should
> 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
feedback
to your individual patches, 2 questions:
1) Can you provide a quick howto (at developer level) on how to
actually
get the spl and u-boot into the nand, what I'm looking for is
unstructions
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 ?
Regards,
Hans
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