[U-Boot] Unable to saveenv to MMC

[Robin Polak]

Thank you for the clarification.  I've correct my issue by partitioning the
MMC storage and formatting the partition FAT.  Then burning the U-Boot
Image to 8K in on the raw media.

On Tue, Dec 18, 2018 at 12:48 AM Heinrich Schuchardt <xypron.glpk at gmx.de>
wrote:

> On 12/6/18 7:12 PM, Robin Polak wrote:
> > Hello.
> >
> >   I'm having trouble persisting my environment variables to the SD Card
> > onto which I have FAT formatted and then written U-Boot to using the
> > following command:
> >
> > sudo dd if=u-boot-sunxi-with-spl.bin of=/dev/disk2 bs=1024 seek=8
> >
> > I get the following error when booting a Linksprite_pcDuino3_Nano with
> the
> > SD Card I've built:
> >
> > U-Boot SPL 2018.11 (Dec 06 2018 - 17:57:48 +0000)
> > DRAM: 1024 MiB
> > CPU: 912000000Hz, AXI/AHB/APB: 3/2/2
> > Trying to boot from MMC1
> >
> >
> > U-Boot 2018.11 (Dec 06 2018 - 17:57:48 +0000) Allwinner Technology
> >
> > CPU:   Allwinner A20 (SUN7I)
> > Model: LinkSprite pcDuino3 Nano
> > I2C:   ready
> > DRAM:  1 GiB
> > MMC:   SUNXI SD/MMC: 0
> > Loading Environment from FAT... Unable to use mmc 0:0... In:    serial
> > Out:   serial
> > Err:   serial
> > SCSI:  SATA link 0 timeout.
> > AHCI 0001.0100 32 slots 1 ports 3 Gbps 0x1 impl SATA mode
> > flags: ncq stag pm led clo only pmp pio slum part ccc apst
> >
> > Net:   eth0: ethernet at 1c50000
> > starting USB...
> > USB0:   USB EHCI 1.00
> > USB1:   USB OHCI 1.0
> > USB2:   USB EHCI 1.00
> > USB3:   USB OHCI 1.0
> > scanning bus 0 for devices... 1 USB Device(s) found
> > scanning bus 2 for devices... 1 USB Device(s) found
> >        scanning usb for storage devices... 0 Storage Device(s) found
> > Hit any key to stop autoboot:  0
> > => saveenv
> > Saving Environment to FAT... Unable to use mmc 0:0... Failed (1)
>
> Partitions are numbered from 1. So partition 1 would be mmc 0:1.
>
> mmc 0:0 would require that there is no partition table and the FAT file
> system starts in block 0.
>
> Please, check the value of CONFIG_ENV_FAT_DEVICE_AND_PART in your
> configuration. The default is CONFIG_ENV_FAT_DEVICE_AND_PART="0:auto"
>
> With "auto" function blk_get_device_part_str() looks for the first
> partition that has the bootable flag set.
>
> So to analyze your problem further please look at the output of
>
> sudo fdisk -l /dev/<your_SD_card>
>
> assuming that you use a DOS partition table.
>
> Best regards
>
> Heinrich
>
> >
> > Thank you for any light that may be shed upon this error.
> >
>
>

-- 
--
Robin Polak
robin at robinpolak.com
917-494-2080