[SPAM] Re: [PATCH] cmd: usb: Prevent reset in usb tree/info command

Xavier Drudis Ferran xdrudis at tinet.cat
Tue Jun 13 08:52:47 CEST 2023 

Ok. New test.

This uses yesterday morning's   next   branch.
commit 5b589e139620214f
Merge: cc5a940923 32d2461e04
Merge branch 'next_net/phy_connect_dev'

USB2 does not work for rk3399 in next (fixes are in master, thanks),
but USB3 is enough.

I compiled for rock-pi-4-rk3399_defconfig

flashed to a new microSD card as per doc/board/rockchip/rockchip.rst :

   dd if=u-boot-rockchip.bin of=/dev/sda seek=64
   sync

Put this microSD card in a Rock Pi 4 B+
Put a new USB stick in the USB3 port (center blue port closer to board).

(the microSD card and USB stick come from factory, I guess they were
partitioned with a single FAT partition)

(make sure emmc and spi are blank)

Connected only serial console and power. 

Got this:

U-Boot TPL 2023.07-rc2-00144-g497967f1ee (Jun 12 2023 - 11:15:47)
lpddr4_set_rate: change freq to 400MHz 0, 1
Channel 0: LPDDR4, 400MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
Channel 1: LPDDR4, 400MHz
BW=32 Col=10 Bk=8 CS0 Row=15 CS1 Row=15 CS=2 Die BW=16 Size=2048MB
256B stride
lpddr4_set_rate: change freq to 800MHz 1, 0
Trying to boot from BOOTROM
Returning to boot ROM...

U-Boot SPL 2023.07-rc2-00144-g497967f1ee (Jun 12 2023 - 11:15:47 +0200)
Trying to boot from MMC1
NOTICE:  BL31: v2.1(release):v2.1-728-ged01e0c4-dirty
NOTICE:  BL31: Built : 18:29:11, Mar 22 2022


U-Boot 2023.07-rc2-00144-g497967f1ee (Jun 12 2023 - 11:15:47 +0200)

SoC: Rockchip rk3399
Reset cause: POR
Model: Radxa ROCK Pi 4B
DRAM:  4 GiB (effective 3.9 GiB)
PMIC:  RK808 
Core:  283 devices, 29 uclasses, devicetree: separate
MMC:   mmc at fe310000: 2, mmc at fe320000: 1, mmc at fe330000: 0
Loading Environment from MMC... *** Warning - bad CRC, using default environment

In:    serial
Out:   serial
Err:   serial
Model: Radxa ROCK Pi 4B
Net:   eth0: ethernet at fe300000
Hit any key to stop autoboot:  2  1  0 
rockchip_pcie pcie at f8000000: PCIe link training gen1 timeout!
Bus usb at fe380000: ehci_generic usb at fe380000: Failed to get clocks (ret=-19)
Port not available.
Bus usb at fe3c0000: ehci_generic usb at fe3c0000: Failed to get clocks (ret=-19)
Port not available.
Bus usb at fe800000: Register 2000140 NbrPorts 2
Starting the controller
USB XHCI 1.10
Bus usb at fe900000: Register 2000140 NbrPorts 2
Starting the controller
USB XHCI 1.10
scanning bus usb at fe800000 for devices... 1 USB Device(s) found
scanning bus usb at fe900000 for devices... cannot reset port 1!?
2 USB Device(s) found
rockchip_pcie pcie at f8000000: failed to find ep-gpios property
ethernet at fe300000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Could not initialize PHY ethernet at fe300000
rockchip_pcie pcie at f8000000: failed to find ep-gpios property
ethernet at fe300000 Waiting for PHY auto negotiation to complete......... TIMEOUT !
Could not initialize PHY ethernet at fe300000
=> printenv preboot
## Error: "preboot" not defined
=> printenv
arch=arm
baudrate=1500000
board=evb_rk3399
board_name=evb_rk3399
boot_targets=mmc1 mmc0 nvme scsi usb pxe dhcp spi

bootcmd=bootflow scan

bootdelay=2
cpu=armv8
cpuid#=[something]
eth1addr=[:so:me:th:in:g]
ethact=ethernet at fe300000
ethaddr=[:so:me:th:in:g]
fdt_addr_r=0x01f00000
fdtcontroladdr=f1ef9170
fdtfile=rockchip/rk3399-rock-pi-4b.dtb
fdtoverlay_addr_r=0x02000000
kernel_addr_r=0x02080000
kernel_comp_addr_r=0x08000000
kernel_comp_size=0x2000000
loadaddr=0x800800
partitions=uuid_disk=${uuid_gpt_disk};name=loader1,start=32K,size=4000K,uuid=${uuid_gpt_loader1};name=loader2,start=8MB,size=4MB,uuid=${uuid_gpt_loader2};name=trust,size=4M,uuid=${uuid_gpt_atf};name=boot,size=112M,bootable,uuid=${uuid_gpt_boot};name=rootfs,size=-,uuid=[something];
pxefile_addr_r=0x00600000
ramdisk_addr_r=0x06000000
script_offset_f=0xffe000
script_size_f=0x2000
scriptaddr=0x00500000
serial#=[something]
soc=rk3399
stderr=serial,vidconsole
stdin=serial,usbkbd
stdout=serial,vidconsole
vendor=rockchip

Environment size: 1041/32764 bytes
=> usb info
1: Hub,  USB Revision 3.0
 - U-Boot XHCI Host Controller 
 - Class: Hub
 - PacketSize: 512  Configurations: 1
 - Vendor: 0x0000  Product 0x0000 Version 1.0
   Configuration: 1
   - Interfaces: 1 Self Powered 0mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 1
     - Class Hub
     - Endpoint 1 In Interrupt MaxPacket 8 Interval 255ms

1: Hub,  USB Revision 3.0
 - U-Boot XHCI Host Controller 
 - Class: Hub
 - PacketSize: 512  Configurations: 1
 - Vendor: 0x0000  Product 0x0000 Version 1.0
   Configuration: 1
   - Interfaces: 1 Self Powered 0mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 1
     - Class Hub
     - Endpoint 1 In Interrupt MaxPacket 8 Interval 255ms

2: Mass Storage,  USB Revision 3.20
 -  USB  SanDisk 3.2Gen1 05017d2e4d7b4ea0c5822c90c51e0b7
 - Class: (from Interface) Mass Storage
 - PacketSize: 512  Configurations: 1
 - Vendor: 0x0781  Product 0x5591 Version 1.0
   Configuration: 1
   - Interfaces: 1 Bus Powered 224mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 2
     - Class Mass Storage, Transp. SCSI, Bulk only
     - Endpoint 1 In Bulk MaxPacket 1024
     - Endpoint 2 Out Bulk MaxPacket 1024

"Synchronous Abort" handler, esr 0x96000010, far 0x101
elr: 000000000021c398 lr : 000000000021ca70 (reloc)
elr: 00000000f3f32398 lr : 00000000f3f32a70
x0 : 0000000000000000 x1 : 00000000000010d1
x2 : 00000000f1f404b8 x3 : 00000000f1f41998
x4 : 00000000ff1a0000 x5 : 0000000000000034
x6 : 000000000000000a x7 : 0000000000000002
x8 : 0000000000000000 x9 : 0000000000000400
x10: 0000000000000006 x11: 000000000001869f
x12: 0000000000000200 x13: 0000000000000000
x14: 00000000ffffffff x15: 00000000f1ef81c3
x16: 0000000000000000 x17: 0000000000000000
x18: 00000000f1f0dd90 x19: 0000000000000000
x20: 00000000f1ef8848 x21: 0000000000000002
x22: 00000000f1ef8848 x23: 0000000000000002
x24: 00000000f1ef8844 x25: 0000000000000000
x26: 0000000000000000 x27: 0000000000000000
x28: 0000000000000000 x29: 00000000f1ef86b0

Code: f0000460 a8c27bfd 91099000 1401e518 (39440401) 
Resetting CPU ...

resetting ...



bootcmd=bootflow scan is because DISTRO_DEFAULTS is not
in configs/rock-pi-4-rk3399_defconfig

I'd say the changes to Kconfig are in ef5e3891f57 and 2d653f686b6.

In any case this causes

bootflow scan 

to be called. This tries to access the media in boot_targets until it reaches
usb ( do_bootflow_scan() in cmd/bootflow.c tries mmc1, mmc0 and nvme unsuccessfully).

I think this adds a UCLASS_BOOTDEV device under a usb mass storage device
as sibling of a UCLASS_BLK device, and this makes usb info recurse
with a null usb_device pointer and a reset at this dereference.

But I'm still reading the code to understand quite exactly how and
which are the paths. I don't understand how much of this is intendeded
and what should be prevented. Thsi is why my patch just fixed the last
consequence, tthe null pointer dereference.

I'll keep looking when I can.

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