Thanks a lot, Sean!
From you answer, it seems like what I am trying to do (i.e. applying that
patch to am335x.dts to set dr_mode to "peripheral") makes sense, though for some reason it does not get applied.
I have been careful in checking that the dts file disappears after I cleansstate u-boot, and that it gets patched in the do_patch step. I have also checked that u-boot.img disappears from the deploy folder when I cleansstate, and gets rebuilt after the patch is applied. And finally, I have made sure that the cleansstate on my image removed it from the deploy folder.
Moreover, I have `find build | grep am335x.dts` to check if I was patching the right file (which should be ensured by the fact that I patch it in the bbappend of the u-boot recipe).
My fear is that for some reason, it does not use am335x.dts to build the device tree but something else entirely, which would mean that I am patching something that is not used.
From u-boot.img, or ideally even from my final image I flash on the sdcard,
is there a way for me to see what is used to define the device tree?
Best,
On Thu, 11 Mar 2021, 00:44 Sean Anderson, seanga2@gmail.com wrote:
On 3/10/21 12:43 PM, Jonas Vautherin wrote:
Hello!
I've made some more tests, but I am stuck and I don't really know what I am missing. Would love to get some insights, if somebody has an idea :-). So my root problem is that I would like to run my pocketbeagle in fastboot mode so that I can flash an image from my laptop over USB (it's a learning experience, I'm new to u-boot).
When I go into the u-boot prompt and run `fastboot usb 0` (after I set `log level 7`), I get:
=> fastboot usb 0 uclass_find_device_by_seq() 0 0 uclass_find_device_by_seq() - not found uclass_find_device_by_seq() 1 0 uclass_find_device_by_seq() - not found cmd_call() Command failed, result=1Similar for `fastboot usb 1` (I don't know which one is the microB on the pocketbeagle), except the numbers are `0 1` and `1 1` in the log output.
The numbers come from /aliases in the device tree. You should read the datasheet/schematic to figure out which is which :)
If I `dm tree`, for some reason I see only usb1@47401800 (according to the `.dts`, usb0 is @47401000).
misc 0 [ + ] ti-musb-wrapper `-- usb@47400000 usb 0 [ ] ti-musb-host `-- usb@47401800Looking at the defconfig (I use Yocto, so `bitbake -c menuconfig u-boot), I see that "Default Device Tree for DT control" is (am335x-evm). Opening
./build/tmp/work/pocketbeagle-poky-linux-gnueabi/u-boot/1_2020.07-r0/git/arch/arm/dts/am335x-evm.dts
(which I believe is the one corresponding to `am335x-evm` in my defconfig), I see the following for usb:
&usb { status = "okay"; }; &usb_ctrl_mod { status = "okay"; }; &usb0_phy { status = "okay"; }; &usb1_phy { status = "okay"; }; &usb0 { status = "okay"; }; &usb1 { status = "okay"; dr_mode = "host"; };And showing usb0 and usb1 with `fdt print` (after I get the value of $fdt_blob with `bdinfo` and use it with `fdt addr $fdt_blob`), I get:
=> fdt print /ocp/usb@47400000/usb@47401000 usb@47401000 { compatible = "ti,musb-am33xx"; status = "okay"; reg = <0x47401400 0x00000400 0x47401000 0x00000200>; reg-names = "mc", "control"; interrupts = <0x00000012>; interrupt-names = "mc"; dr_mode = "otg"; mentor,multipoint = <0x00000001>; mentor,num-eps = <0x00000010>; mentor,ram-bits = <0x0000000c>; mentor,power = <0x000001f4>; phys = <0x00000037>; dmas = * 0x9df20aa8 [0x00000168]; dma-names = "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7","rx8", "rx
9", "rx10", "rx11", "rx12", "rx13", "rx14", "rx15", "tx1", "tx2", "tx3",
"tx4", "tx5", "tx6", "tx7", "tx8", "tx9", "tx10", "tx11", "tx12", "tx13", "tx14", "tx15";
};
and=> fdt print /ocp/usb@47400000/usb@47401800 usb@47401800 { compatible = "ti,musb-am33xx"; status = "okay"; reg = <0x47401c00 0x00000400 0x47401800 0x00000200>; reg-names = "mc", "control"; interrupts = <0x00000013>; interrupt-names = "mc"; dr_mode = "host"; mentor,multipoint = <0x00000001>; mentor,num-eps = <0x00000010>; mentor,ram-bits = <0x0000000c>; mentor,power = <0x000001f4>; phys = <0x00000039>; dmas = * 0x9df20e50 [0x00000168]; dma-names = "rx1", "rx2", "rx3", "rx4", "rx5", "rx6", "rx7",
"rx8", "rx9", "rx10", "rx11", "rx12", "rx13", "rx14", "rx15", "tx1", "tx2", "tx3", "tx4", "tx5", "tx6", "tx7", "tx8", "tx9", "tx10", "tx11", "tx12", "tx13", "tx14", "tx
15"; };
My understanding is therefore that `usb0` is in "otg" mode, and `usb1` is in "host" mode. But that does not really tell me why `fastboot usb 0` and `fastboot usb 1` failed.Yes. The U-Boot driver only supports host and peripheral modes, so no otg device is created. And fastboot cannot work with a USB host.
I have also tried to edit `am335x-evm.dts` and set both to "peripheral" (I do that in a Yocto patch step and make sure I `bitbake -c cleansstate u-boot` and `bitbake -c clean <my-image>` before I rebuild):
&usb0 { status = "okay"; dr_mode = "peripheral"; }; &usb1 { status = "okay"; dr_mode = "peripheral"; };But that does not change anything in the `fdt print` output: usb0 is still "otg" and usb1 is still "host". Which makes me guess I may be modifying the wrong `am335x-evm.dts`, but I really don't know how I could check that.
Does cleaning wipe your changes? There should be some yocto way to apply patches; perhaps someone else can comment on that.
--Sean
Again, any hints are appreciated, I'm happy to DuckDuckGo some new
keywords or ideas as my goal is to learn about u-boot, but right now I'm just stuck :-).
Best Regards, Jonas
On Sun, Mar 7, 2021 at 7:31 PM Jonas Vautherin <
jonas.vautherin@gmail.com mailto:jonas.vautherin@gmail.com> wrote:
Yes that was it! I had used `log help`, but misunderstood theoutput. My bad... Below is the debug output I receive, where I don't really get what's happening except for those two lines:
``` uclass_find_device_by_seq() - 1 -1 'usb@47401800' uclass_find_device_by_seq() - not found ``` But I don't really understand what it means. I spent a lot of timereading the available options in menuconfig, and at that point I cannot say what I am doing wrong. Note that I am using the `am335x_evm_defconfig` defconfig, which I changed to get more logging outputs.
Here is the output of `usb start`, let me know if I am missingsomething obvious from there:
``` => usb start starting USB... Bus usb@47401800: __of_translate_address() OF: ** translation fordevice usb@47401800 **
__of_translate_address() OF: bus is default (na=1, ns=1) onusb@47400000
__of_translate_address() OF: parent bus is default (na=1, ns=1) onocp
of_translate_one() OF: no ranges, 1:1 translation of_translate_one() OF: with offset: 1195382784 __of_translate_address() OF: parent bus is default (na=1, ns=1) on of_translate_one() OF: no ranges, 1:1 translation of_translate_one() OF: with offset: 1195382784 __of_translate_address() OF: reached root node fdtdec_lookup_phandle() fdtdec_lookup_phandle: phys fdtdec_lookup_phandle() fdtdec_lookup_phandle: ti,ctrl_mod fdtdec_get_addr_size_fixed() fdtdec_get_addr_size_fixed: reg:fdtdec_get_addr_size_fixed() addr=44e10620
fdtdec_get_int() fdtdec_get_int: mentor,multipoint: fdtdec_get_int()0x1 (1)
fdtdec_get_int() fdtdec_get_int: mentor,num-eps: fdtdec_get_int()0x10 (16)
fdtdec_get_int() fdtdec_get_int: mentor,ram-bits: fdtdec_get_int()0xc (12)
fdtdec_get_int() fdtdec_get_int: mentor,power: fdtdec_get_int()0x1f4 (500)
uclass_find_device_by_seq() 0 1 uclass_find_device_by_seq() - 1 -1 'usb@47401800' uclass_find_device_by_seq() - not found clk_set_defaults() clk_set_defaults(usb@47401800) clk_set_default_parents() clk_set_default_parents: could not readassigned-clock-parents for 9df24d30
ofnode_read_prop() ofnode_read_prop: assigned-clock-rates:ofnode_read_prop() <not found>
musb_core_init() musb-hdrc: hw_ep 0shared, max 64 musb_core_init() musb-hdrc: hw_ep 1tx, max 512 musb_core_init() musb-hdrc: hw_ep 1rx, max 512 musb_core_init() musb-hdrc: hw_ep 2tx, max 512 musb_core_init() musb-hdrc: hw_ep 2rx, max 512 musb_core_init() musb-hdrc: hw_ep 3tx, max 512 musb_core_init() musb-hdrc: hw_ep 3rx, max 512 musb_core_init() musb-hdrc: hw_ep 4tx, max 512 musb_core_init() musb-hdrc: hw_ep 4rx, max 512 musb_core_init() musb-hdrc: hw_ep 5tx, max 512 musb_core_init() musb-hdrc: hw_ep 5rx, max 512 musb_core_init() musb-hdrc: hw_ep 6tx, max 512 musb_core_init() musb-hdrc: hw_ep 6rx, max 512 musb_core_init() musb-hdrc: hw_ep 7tx, max 512 musb_core_init() musb-hdrc: hw_ep 7rx, max 512 musb_core_init() musb-hdrc: hw_ep 8tx, max 512 musb_core_init() musb-hdrc: hw_ep 8rx, max 512 musb_core_init() musb-hdrc: hw_ep 9tx, max 512 musb_core_init() musb-hdrc: hw_ep 9rx, max 512 musb_core_init() musb-hdrc: hw_ep 10tx, max 256 musb_core_init() musb-hdrc: hw_ep 10rx, max 64 musb_core_init() musb-hdrc: hw_ep 11tx, max 256 musb_core_init() musb-hdrc: hw_ep 11rx, max 64 musb_core_init() musb-hdrc: hw_ep 12tx, max 256 musb_core_init() musb-hdrc: hw_ep 12rx, max 64 musb_core_init() musb-hdrc: hw_ep 13shared, max 4096 musb_core_init() musb-hdrc: hw_ep 14shared, max 1024 musb_core_init() musb-hdrc: hw_ep 15shared, max 1024 musb_start() <== devctl 80 musb_stop() HDRC disabled Port not available. usb_init() scan end ``` Best, On Sun, Mar 7, 2021 at 3:04 AM Sean Anderson <seanga2@gmail.commailto:seanga2@gmail.com> wrote:
On 3/6/21 8:38 PM, Jonas Vautherin wrote: > Thanks a lot Sean! > > I tried to enable logging by using the following CONFIG_: > > ``` > CONFIG_LOG=y > CONFIG_SPL_LOG=y > CONFIG_TPL_LOG=y > CONFIG_LOG_MAX_LEVEL=5 You need to increase this. Log levels are only compiled-in ifthey are
less than the max log level. > CONFIG_SPL_LOG_MAX_LEVEL=3 > CONFIG_TPL_LOG_MAX_LEVEL=3 > CONFIG_LOG_DEFAULT_LEVEL=7 > CONFIG_LOG_CONSOLE=y > CONFIG_SPL_LOG_CONSOLE=y > CONFIG_TPL_LOG_CONSOLE=y > > CONFIG_CMD_LOG=y > ``` > > And I got the "log" function indeed. But it did not have theeffect I was hoping for:
> > ``` > => log level set 7 Use the help function ;) The correct syntax is "log level 7" If you use a newer U-Boot (newer than 2021.01) then the outputwill be
more verbose. E.g. => log level EMERG ALERT CRIT ERR WARNING NOTICE INFO (default) DEBUG --Sean > => log level > Default log level: 0 > => usb start > starting USB... > Bus usb@47401800: Port not available. > ``` > > First, I don't get why it says "Default log level: 0" after Iset it (to whatever number, apparently). And second, it does not seem to bring me more output about the usb issue :-/.
> > Am I missing something? > > Best, > Jonas > > On Sat, Mar 6, 2021 at 3:20 AM Sean Anderson <seanga2@gmail.com mailto:seanga2@gmail.com <mailto:seanga2@gmail.com mailto:seanga2@gmail.com>> wrote:
> > On 3/5/21 7:10 PM, Jonas Vautherin wrote: > > Hello! > > > > I am learning about Fastboot, and I would like to runit from u-boot and
> > detect it from my host computer (I have the tools onmy host, that's
> > working with other devices). > > > > I am using a pocketbeagle and I built an image usingYocto. I can get into
> > the u-boot prompt at boot time, and I get thefollowing output:
> > > > ``` > > Rebooting... reboot: Restarting system > > > > U-Boot SPL 2020.07 (Jul 06 2020 - 19:22:53 +0000) > > Trying to boot from MMC1 > > > > > > U-Boot 2020.07 (Jul 06 2020 - 19:22:53 +0000) > > > > CPU : AM335X-GP rev 2.1 > > Model: TI AM335x PocketBeagle > > DRAM: 512 MiB > > WDT: Started with servicing (60s timeout) > > NAND: 0 MiB > > MMC: OMAP SD/MMC: 0 > > Loading Environment from FAT... *** Warning - bad CRC,using default
> > environment > > > > <ethaddr> not set. Validating first E-fuse MAC > > Net: No ethernet found. > > Hit any key to stop autoboot: 2 > > ``` > > > > If I hit a key here, I get the u-boot prompt (`=>`)where I find
> > "fastboot". The thing is that none of the fastbootcommands I run have any
> > output: > > This is normal. There will be output only when you issuecommands.
> > > > > * fastboot usb 0 > > * fastboot usb > > * fastboot udp > > > > Now, fastboot udp is not enabled in my defconfig, butthe udp gadget
> > support is, and the usb fastboot gadget is enabled,too. From my host, I
> > just don't see anything in the `dmesg` output. > > > > Here are a few questions: > > > > * Does fastboot usb go over ethernet? If yes, I guessthat the "Net: No
> > ethernet found." message is an issue that I need tofix such that a new usb
> > network interface is created by my host, but from mytests with this
> > proprietary device I own, it does not seem to beenumerated as a network
> > interface. > > Only udp goes over ethernet (though I suppose you coulduse a
> usb-ethernet gadget/dongle). > > > * In readthedocs [1], it mentions that "TheCONFIG_USB_GADGET_VENDOR_NUM
> > must be one of the numbers supported by the fastbootclient." In my setup,
> > it is set to 0x0451, and I did not find what issupposed to be supported in
> > fastboot.cpp [2]. So from the host, I also tried`fastboot -i 0x0451
> > devices`. Is that an issue? > > The fastboot client detects devices with two bulkendpoints and the
> correct interface (see match_fastboot andfilter_usb_device). Generally,
> you will only have to specify the vid/pid/serial if youhave multiple
> devices plugged in at once. > > > * I thought that maybe I should start USB, because theoutput of `usb tree`
> > says "USB is stopped. Please issue 'usb start'first.". But running `usb
> > start` errors with "Bus usb@47401800: Port notavailable.". Is that related
> > to fastboot at all, i.e. should I be concerned aboutthat? And how can I
> > debug it? > > That's probably why your fastboot isn't working :) > > You can try debugging it by enabling debug messages. Ifyou want less than
> a firehose, you can try setting the default log level toinfo, and then
> setting it to debug before running usb start. See [1] fordetails.
> > [1]https://u-boot.readthedocs.io/en/latest/develop/logging.html
> > --Sean > > > Thanks in advance for the help! > > Jonas > > > > [1]:https://u-boot.readthedocs.io/en/latest/android/fastboot.html
> > [2]: > >https://android.googlesource.com/platform/system/core/+/master/fastboot/fast...
> > >