[PATCH u-boot-marvell v3 00/39] kwboot higher baudrate

[Pali Rohár]

On Friday 22 October 2021 10:38:16 Stefan Roese wrote:
> Hi Marek, Hi Pali,
> 
> since now all is merged into master, I'm testing on my AXP target
> again. Please see below.
> 
> On 01.10.21 12:45, Marek Behún wrote:
> > On Fri, 1 Oct 2021 12:40:29 +0200
> > Stefan Roese <sr at denx.de> wrote:
> > 
> > > U-Boot SPL 2021.10-rc5-00431-g6c96332441cf-dirty (Oct 01 2021 - 12:38:55
> > > +0200)
> > > High speed PHY - Version: 2.1.5 (COM-PHY-V20)
> > > High speed PHY - Ended Successfully
> > > DDR3 Training Sequence - Ver 5.7.4
> > > DDR3 Training Sequence - Ended Successfully
> > > Trying to boot from BOOTROM
> > > Returning to BootROM (return address 0xffff0aa0)...
> > > rc=-1 errno=110 allow_non_xm=1 *non_xm_print=1
> > > 
> > > 
> > > xmodem: Connection timed out
> > 
> > No ACK from BootROM. It is possible that return_from_bootrom() was not
> > called, or failed, somehow in SPL.
> 
> I'm not getting this when using master:
> 
> [stefan at ryzen u-boot (master)]$ ./tools/kwboot -B 230400 -p -b
> u-boot-spl.kwb -t
> /dev/serial/by-id/usb-FTDI_FT232R_USB_UART_A1019EGY-if00-port0
> Patching image boot signature to UART
> Injecting binary header code for changing baudrate to 230400 Bd
> Injecting code for changing baudrate back
> Aligning image header to Xmodem block size
> Sending boot message. Please reboot the target.../
> Waiting 2s and flushing tty
> Sending boot image header (90496 bytes)...
>   0 %
> [......................................................................]
>  10 %
> [......................................................................]
>  19 %
> [......................................................................]
>  29 %
> [......................................................................]
>  39 %
> [......................................................................]
>  49 %
> [......................................................................]
>  59 %
> [......................................................................]
>  69 %
> [......................................................................]
>  79 %
> [......................................................................]
>  89 %
> [......................................................................]
>  99 % [.......       ]
> Done
> 
> U-Boot SPL 2021.10-00815-gf200a4bcecf1-dirty (Oct 22 2021 - 10:33:19 +0200)
> High speed PHY - Version: 2.1.5 (COM-PHY-V20)
> High speed PHY - Ended Successfully
> DDR3 Training Sequence - Ver 5.7.4
> DDR3 Training Sequence - Ended Successfully
> Trying to boot from BOOTROM
> Returning to BootROM (return address 0xffff0aa0)...
> 
> Changing baudrate to 230400 Bd
> Baudrate was not changed
> 
> 
> xmodem: Protocol error
> 
> It works with the standard 115k. Any ideas why switching baudrate fails
> on AXP?

When 115k baudrate is specified (or no baudrate is specified) then
kwboot does not inject any code for changing baudrate (as 115k is
default). So it looks like that issue is with switching.

I have already some more "fixup" patches for kwboot and kwbimage, which
are fixing some issues which I found. So it is possible that you hit
some of that issue. I will pass patches to Marek and after some testing
we will send them to mailing list for review.

I do not have any AXP board, so I cannot test or debug it manually.