Hi,
On 22-05-15 09:04, Roy Spliet wrote:
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:
- 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.
- Build
- 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
Ok, it took me way longer then I wanted (see below) but I've this working now. It is cool to see u-boot load from nand :)
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.
Alex, could it be that you are writing the nand using a (rebased) version of bbrezillon's sunxi-nand-next branch ?
I started with that too because it is much newer and contains various bug fixes, but it seems that it also contains a new bug causing it to write the NAND in such a way that the BROM and u-boot SPL code will not read it.
I've just pushed a rebased version of the sunxi-nand branch of Boris here:
https://github.com/jwrdegoede/linux-sunxi/commits/sunxi-nand-experiment
And that works for me, where as before I got the exact same errors trying to fel load a nand enabled spl.
I'm working on merging over all the changes from the sunxi-nand-next branch onto my working sunxi-nand-experiment branch 1 by 1 until I find the one which causes the breakage...
Regards,
Hans
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 kaplan2539@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