A38x: Broken Linux kernel booting over UART

[Tom Rini]

On Mon, Oct 11, 2021 at 04:25:48PM +0200, Pali Rohár wrote:
> On Monday 11 October 2021 10:03:21 Tom Rini wrote:
> > On Mon, Oct 11, 2021 at 12:13:29PM +0200, Pali Rohár wrote:
> > 
> > > Hello!
> > > 
> > > Current U-Boot master has broken booting of Linux kernel over UART on
> > > A38x.
> > > 
> > > After transferring image over UART it just prints:
> > > 
> > > CACHE: Misaligned operation at range [01000000, 014e5d96]
> > > ## Total Size      = 0x004e5d96 = 5135766 Bytes
> > > ## Start Addr      = 0x01000000
> > > Kernel image @ 0x1000000 [ 0x000000 - 0x4e0e60 ]
> > > FDT and ATAGS support not compiled in
> > > 
> > > resetting ...
> > > 
> > > It resets board and does not boot kernel. Note that I'm trying to boot
> > > recent 5.15 kernel image, not something old.
> > > 
> > > I did git bisect and it found following commit which broke booting:
> > > 
> > > 9774462e34faaa64a91eb9c68b438a52d22bba6a is the first bad commit
> > > commit 9774462e34faaa64a91eb9c68b438a52d22bba6a
> > > Author: Tom Rini <trini at konsulko.com>
> > > Date:   Mon Aug 30 09:16:30 2021 -0400
> > > 
> > >     arm: Disable ATAGs support
> > > 
> > > Prior this commit booting working fine.
> > > 
> > > Do you have any idea what is with above commit? Or any hints?
> > 
> > Can you provide the full log of what you're doing?  And what's in that
> > image you're passing, exactly?  Thanks.
> 
> Here is full log:
> 
> $ make CROSS_COMPILE=arm-linux-gnueabihf- turris_omnia_defconfig
> ...
> $ make CROSS_COMPILE=arm-linux-gnueabihf- -j8
> ...
> $ ./tools/kwboot -b ./u-boot-spl.kwb -B 5200000 -t /dev/ttyUSB0
> Patching image boot signature to UART
> Injecting binary header code for changing baudrate to 5200000 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 (115072 bytes)...
>   0 % [......................................................................]
> ...
>  93 % [...........................................................           ]
> Done
> 
> U-Boot SPL 2021.10-00600-gf331497d3ad4 (Oct 11 2021 - 16:13:39 +0200)
> High speed PHY - Version: 2.0
> MiniPCIe/mSATA card detection... MiniPCIe
> Detected Device ID 6820
> board SerDes lanes topology details:
>  | Lane # | Speed |  Type       |
>  --------------------------------
>  |   0    |   5   | PCIe0       |
>  |   1    |   5   | USB3 HOST0  |
>  |   2    |   5   | PCIe1       |
>  |   3    |   5   | USB3 HOST1  |
>  |   4    |   5   | PCIe2       |
>  |   5    |   0   | SGMII2      |
>  --------------------------------
> High speed PHY - Ended Successfully
> mv_ddr: 14.0.0 
> DDR3 Training Sequence - Switching XBAR Window to FastPath Window
> mv_ddr: completed successfully
> Disabling MCU watchdog... disabled
> Trying to boot from BOOTROM
> Returning to BootROM (return address 0xffff05c4)...
> 
> Changing baudrate to 5200000 Bd
> 
> Sending boot image data (747780 bytes)...
>   0 % [......................................................................]
> ...
>  99 % [.................................                                     ]
> Done
> Finishing transfer
> 
> Changing baudrate back to 115200 Bd
> 
> [Type Ctrl-\ + c to quit]
> 
> 
> U-Boot 2021.10-00600-gf331497d3ad4 (Oct 11 2021 - 16:13:39 +0200)
> 
> SoC:   MV88F6820-A0 at 1600 MHz
> DRAM:  2 GiB (800 MHz, 32-bit, 2T, ECC not enabled)
> WDT:   Started watchdog at 20300 with servicing (60s timeout)
> MMC:   mv_sdh: 0
> Loading Environment from SPIFlash... SF: Detected s25fl164k with page size 256 Bytes, erase size 4 KiB, total 8 MiB
> OK
> Model: Turris Omnia
> Turris Omnia:
>   RAM size: 2048 MiB
>   Serial Number: 0000000B00007B3C
> Regdomain set to **
> Net:   eth0: ethernet at 70000, eth1: ethernet at 30000, eth2: ethernet at 34000
> =>
> 
> $ kermit
> C-Kermit>set line /dev/ttyUSB0
> C-Kermit>set speed 115200
> C-Kermit>set carrier-watch off
> C-Kermit>connect
> Connecting to /dev/ttyUSB0, speed 115200
>  Escape character: Ctrl-\ (ASCII 28, FS): enabled
> Type the escape character followed by C to get back,
> or followed by ? to see other options.
> ----------------------------------------------------
> 
> => echo $uart_boot
> loadb $kernel_addr_r 5200000 && part uuid mmc 0:1 partuuid && setenv bootargs earlyprintk rootwait console=ttyS0,115200 rootfstype=btrfs root=PARTUUID=${partuuid} rootflags=commit=5,subvol=@ rw cfg80211.freg=${regdomain} && bootz ${kernel_addr_r}
> => run uart_boot
> ## Switch baudrate to 5200000 bps and press ENTER ...
> C-Kermit>set speed 5200000
> ?No keywords match - 5200000 (,Transmission rate for /dev/ttyUSB0 (bits per second))
> 
> ?SET SPEED fails, speed is 5260273
> C-Kermit>send /tmp/kernel
> C-Kermit>set speed 115200
> /dev/ttyUSB0, 115200 bps
> C-Kermit>connect
> CACHE: Misaligned operation at range [01000000, 014e5d96]
> ## Total Size     = 0x004e5d96 = 5135766 Bytes
> ## Start Addr      = 0x01000000
> ## Switch baudrate to 115200 bps and press ESC ...
> Kernel image @ 0x1000000 [ 0x000000 - 0x4e0e60 ]
> FDT and ATAGS support not compiled in
> 
> resetting ...

OK, and is /tmp/kernel something with an appended dtb then?

-- 
Tom
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