i.MX8MN (ROMv2) fails to boot over USB

Adam Ford aford173 at gmail.com
Wed Jan 26 19:01:10 CET 2022


On Wed, Jan 26, 2022 at 11:24 AM Michael Nazzareno Trimarchi
<michael at amarulasolutions.com> wrote:
>
> Hi Adam
>
> On Wed, Jan 26, 2022 at 2:26 AM Tim Harvey <tharvey at gateworks.com> wrote:
> >
> > On Tue, Jan 25, 2022 at 3:49 PM Adam Ford <aford173 at gmail.com> wrote:
> > >
> > > I have a flash.bin file that boots over MMC just fine, but when I use
> > > that same flash.bin file, it appears to hang after running ATF.  I
> > > dumped some debug info for printing the handling of the FIT file, and
> > > I noticed the fit read sizes are also not consistent between MMC and
> > > USB loads with the identical flash.bin.
> > >
> > > MMC booting is calling spl_romapi_raw_seekable_read, but the USB
> > > booting is not.  Maybe this is normal.
> > >
> > > I was hoping someone might have some pointers on how I can
> > > troubleshoot this.  It's also weird to me that the various nodes are
> > > listed twice in the USB boot, but not the MMC boot.
> > >
> > > I have poked around in the spl_imx_romapi.c file, but I am not seeing
> > > anything obvious.
> > >
> > > SPL and ATF are executing, so it's partially decoding the FIT file and
> > > executing those two pieces correctly from what I can see.
> > >
> > > USB log (no FDT)
> > > U-Boot SPL 2022.01-00753-g7f7f25ecb8-dirty (Jan 25 2022 - 15:54:57 -0600)
> > > WDT:   Started watchdog at 30280000 with servicing (60s timeout)
> > > Trying to boot from BOOTROM
> > > Find img info 0x&48027600, size 872
> > > Need continue download 1024
> > > fit read sector 48027600, sectors=872, dst=42206c40, count=872, size=0x368
> > > firmware: 'uboot'
> > > External data: dst=40200000, offset=3000, size=a4d98
> > > fdt: 'fdt'
> > > External data: dst=402a4dc0, offset=b1e60, size=af68
> > > loadables: 'atf'
> > > External data: dst=960000, offset=a7d98, size=a0c6
> > > no string for index 1
> > > Download 772040, Total size 773576
> > > fit read sector 48027600, sectors=872, dst=42206fb0, count=872, size=0x368
> > > firmware: 'uboot'
> > > External data: dst=40200000, offset=3000, size=a4d98
> > > fdt: 'fdt'
> > > External data: dst=402a4dc0, offset=b1e60, size=af68
> > > loadables: 'atf'
> > > External data: dst=960000, offset=a7d98, size=a0c6
> > > no string for index 1
> > > NOTICE:  BL31: v2.4(release):lf-5.10.72-2.2.0-0-g5782363f9
> > > NOTICE:  BL31: Built : 14:45:34, Jan 25 2022
> > >
> > > <hang>
> > >
> > > MMC Booting Log (with DTB):
> > >
> > > U-Boot SPL 2022.01-00753-g7f7f25ecb8-dirty (Jan 25 2022 - 15:54:57 -0600)
> > > WDT:   Started watchdog at 30280000 with servicing (60s timeout)
> > > Trying to boot from BOOTROM
> > > image offset 0x8000, pagesize 0x200, ivt offset 0x0
> > > ROM API load from 0x60000, size 0x400
> > > spl_romapi_raw_seekable_read 0x60000, size 0x400
> > > fit read sector 300, sectors=2, dst=42206c40, count=2, size=0x368
> > > firmware: 'uboot'
> > > ROM API load from 0x63000, size 0xa4e00
> > > spl_romapi_raw_seekable_read 0x63000, size 0xa4e00
> > > External data: dst=40200000, offset=3000, size=a4d98
> > > fdt: 'fdt'
> > > ROM API load from 0x111e00, size 0xb000
> > > spl_romapi_raw_seekable_read 0x111e00, size 0xb000
> > > External data: dst=402a4dc0, offset=b1e60, size=af68
> > > loadables: 'atf'
> > > ROM API load from 0x107c00, size 0xa400
> > > spl_romapi_raw_seekable_read 0x107c00, size 0xa400
> > > External data: dst=960000, offset=a7d98, size=a0c6
> > > no string for index 1
> > > NOTICE:  BL31: v2.4(release):lf-5.10.72-2.2.0-0-g5782363f9
> > > NOTICE:  BL31: Built : 14:45:34, Jan 25 2022
> > >
> > > <u-boot loads successfully from here>
> >
> > Adam,
> >
> > I've previously run into this as well and unfortunately have no
> > solution. Note that I had to hack in some support to the SPL for USB
> > which I assume you've done as well. If I recall trying to enable
> > DM_USB for the SPL took too much space so that hacks I had revolved
> > around getting it to work in the non-DM fashion.
>
> I was having the same problem and I found that was related to
> diff --git a/arch/arm/mach-imx/imx8m/soc.c b/arch/arm/mach-imx/imx8m/soc.c
> index 863508776d..9d6dab08e6 100644
> --- a/arch/arm/mach-imx/imx8m/soc.c
> +++ b/arch/arm/mach-imx/imx8m/soc.c
> @@ -1333,6 +1333,7 @@ enum env_location env_get_location(enum
> env_operation op, int prio)
>
> You should support USB_BOOT in switch case or change your defconfig
> and add CONFIG_ENV_IS_NOWHERE=y

Thanks for the tip.  it strikes me as odd that the system would hang
if we don't know what to do with the environment.  I would expect it
to just load the default and move on.

I'll work on a defconfig fix.

adam
>
> Michael
>
>
> >
> > Best regards,
> >
> > Tim


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