Date: Thu, 8 Oct 2020 23:01:33 -0700 From: Mark Millard <marklmi@yahoo.com> To: Klaus Cucinauomo <maciphone2@googlemail.com> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: RPi4B: emmc2bus dma-range handling does not track the boot-time-FDT (u-boot based booting) Message-ID: <2B3F0409-88F2-4EBD-9C39-37929F973C77@yahoo.com> In-Reply-To: <91324D35-B66A-4674-AE37-45F3DDB736FD@yahoo.com> References: <D8BDF95A-D6A8-4E95-A0CE-D53068E8355B.ref@yahoo.com> <D8BDF95A-D6A8-4E95-A0CE-D53068E8355B@yahoo.com> <ABE16EA6-49F1-461F-9B8A-6DAA7ED6A18D@googlemail.com> <98BC985D-EAAB-4AFB-AA8F-7391A45C4EBF@yahoo.com> <91324D35-B66A-4674-AE37-45F3DDB736FD@yahoo.com>
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On 2020-Oct-8, at 21:29, Mark Millard <marklmi at yahoo.com> wrote:
> On 2020-Oct-8, at 20:06, Mark Millard <marklmi at yahoo.com> wrote:
>=20
>> On 2020-Oct-8, at 06:27, Klaus Cucinauomo <maciphone2 at =
googlemail.com> wrote:
>>=20
>>>> Am 08.10.2020 um 11:01 schrieb Mark Millard via freebsd-arm =
<freebsd-arm@freebsd.org>:
>>>>=20
>>>>=20
>>>> The old u-boot/DTB combination in use does not have emmc2bus.
>>>> And, even if it did, FreeBSD would not use =E2=80=A6=E2=80=A6=E2=80=A6=
.
>>>=20
>>> =E2=80=A6 and the new 2020.10- combinations will even be more =
annoying=E2=80=A6
>>> While I meanwhile e.g. could boot the 4GB off of xhci, it hangs in =
DeviceTree,
>>> Depending on GUESSED ;-) combinations and DeviceTree-patches in src =
.
>>> There have to be necessary adjustments which are even not yet =
upstreamed in u-boot=20
>>> (depending on hw-revisions)=E2=80=A6and so on ...
>>> I doubt that anyone really will take explicitly time consuming care =
of all that annoying RPI4-crap.
>>> I don't see any other way than targeting minimum 1 developer(better =
more) ONLY to the RPI-platform=20
>>> for a time period=E2=80=A6 other than leaving it crappy as is and =
to be happy that it nevertheless=20
>>> is a working fbsd-gadget :-)
>>=20
>>=20
>> Summary of probable-cause finding: u-boot 2020.10 is
>> expecting:
>>=20
>> compatible =3D "brcm,generic-xhci"
>>=20
>> instead of what seems to be in files that are in use
>> by FreeBSD:
>>=20
>> compatible =3D "generic-xhci"
>>=20
>> (I've no clue what all the other differences in the .dtb
>> file contents might be.)
>>=20
>>=20
>>=20
>> The details of what I learned that reached that status . . .
>>=20
>> I updated my ports environment on a RPi4 to build the final 2020.10 =
u-boot
>> for the RPi4. I then built it and replaced the u-boot.bin on the =
microsd
>> card that I boot with via the FreeBSD kernel being from that microsd =
card
>> but later stages being from the USB3 SSD. I did not update anything =
else.
>> So: still an older .dtb file.
>>=20
>> That 8 GiByte RPi4B context booted just fine.
>>=20
>> I then rebooted and had it stop in u-boot and looked around just a =
little
>> bit.
>>=20
>> U-Boot 2020.10 (Oct 09 2020 - 00:51:29 +0000)
>>=20
>> DRAM: 7.9 GiB
>> RPI 4 Model B (0xd03114)
>> MMC: mmc@7e300000: 1, emmc2@7e340000: 0
>> Loading Environment from FAT... In: serial
>> Out: vidconsole
>> Err: vidconsole
>> Net: eth0: ethernet@7d580000
>> PCIe BRCM: link up, 5.0 Gbps x1 (SSC)
>> starting USB...
>> Bus xhci_pci: probe failed, error -110
>> No working controllers found
>> Hit any key to stop autoboot: 0=20
>>=20
>> So it reproted the problem above. Yet . . .
>>=20
>> U-Boot> pci 0
>> Scanning PCI devices on bus 0
>> BusDevFun VendorId DeviceId Device Class Sub-Class
>> _____________________________________________________________
>> 00.00.00 0x14e4 0x2711 Bridge device 0x04
>>=20
>> U-Boot> pci 1 =20
>> Scanning PCI devices on bus 1
>> BusDevFun VendorId DeviceId Device Class Sub-Class
>> _____________________________________________________________
>> 01.00.00 0x1106 0x3483 Serial bus controller 0x03
>>=20
>> So it does see the xHCI on the pci bus despite the
>> "Bus xhci_pci: probe failed, error -110". -110 looks
>> to be -ETIMEDOUT .
>>=20
>> Looking at the v2020.10/drivers/usb/host/xhci-pci.c source
>> code shows that the xhci_pci driver has:
>>=20
>> . . .
>> static const struct udevice_id xhci_pci_ids[] =3D {
>> { .compatible =3D "xhci-pci" },
>> { }
>> };
>>=20
>> U_BOOT_DRIVER(xhci_pci) =3D {
>> .name =3D "xhci_pci",
>> .id =3D UCLASS_USB,
>> .probe =3D xhci_pci_probe,
>> .remove =3D xhci_deregister,
>> .of_match =3D xhci_pci_ids,
>> .ops =3D &xhci_usb_ops,
>> .platdata_auto_alloc_size =3D sizeof(struct usb_platdata),
>> .priv_auto_alloc_size =3D sizeof(struct xhci_ctrl),
>> .flags =3D DM_FLAG_ALLOC_PRIV_DMA,
>> };
>>=20
>> static struct pci_device_id xhci_pci_supported[] =3D {
>> { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0) },
>> {},
>> };
>>=20
>> U_BOOT_PCI_DEVICE(xhci_pci, xhci_pci_supported);
>>=20
>> (It looks like the above driver is used as the default
>> driver if no explicit match is found. It has been around
>> for years.)
>>=20
>>=20
>> But, in the past when I showed the likes of fdt print /
>> or translation to a .dts file, it did not have "xhci-pci"
>> in compatible but had "generic-xhci" instead, such as:
>>=20
>> xhci@7e9c0000 {
>> compatible =3D "generic-xhci";
>> status =3D "disabled";
>> reg =3D <0x00000000 0x7e9c0000 0x00000000 =
0x00100000>;
>> interrupts =3D <0x00000000 0x000000b0 =
0x00000004>;
>> phandle =3D <0x000000d3>;
>> };
>>=20
>> For reference, for FreeBSD there is:
>>=20
>> # grep -ri "xhci-pci" /usr/src/sys/ | more
>> # grep -ri "generic-xhci" /usr/src/sys/ | more
>> /usr/src/sys/dev/usb/controller/generic_xhci_fdt.c: =
{"generic-xhci", true},
>> /usr/src/sys/gnu/dts/arm/bcm-nsp.dtsi: compatible =3D =
"generic-xhci";
>> /usr/src/sys/gnu/dts/arm/bcm5301x.dtsi: =
compatible =3D "generic-xhci";
>> /usr/src/sys/gnu/dts/arm64/broadcom/stingray/stingray-usb.dtsi: =
compatible =3D "generic-xhci";
>> /usr/src/sys/gnu/dts/arm64/broadcom/stingray/stingray-usb.dtsi: =
compatible =3D "generic-xhci";
>> /usr/src/sys/gnu/dts/arm64/marvell/armada-37xx.dtsi: =
"generic-xhci";
>> /usr/src/sys/gnu/dts/arm64/marvell/armada-cp11x.dtsi: =
"generic-xhci";
>> /usr/src/sys/gnu/dts/arm64/marvell/armada-cp11x.dtsi: =
"generic-xhci";
>>=20
>> That FreeBSD generic_xhci_fdt.c match is from:
>>=20
>> static struct ofw_compat_data compat_data[] =3D {
>> {"marvell,armada-380-xhci", true},
>> {"marvell,armada3700-xhci", true},
>> {"marvell,armada-8k-xhci", true},
>> {"generic-xhci", true},
>> {NULL, false}
>> };
>>=20
>> (End for-reference.)
>>=20
>> There is another driver in u-boot 2020.10, one that
>> does mention "generic-" for xhci in
>> drivers/usb/host/xhci-brcm.c :
>>=20
>> static const struct udevice_id xhci_brcm_ids[] =3D {
>> { .compatible =3D "brcm,generic-xhci" },
>> { }
>> };
>>=20
>> U_BOOT_DRIVER(usb_xhci) =3D {
>> .name =3D "xhci_brcm",
>> .id =3D UCLASS_USB,
>> .probe =3D xhci_brcm_probe,
>> .remove =3D xhci_brcm_deregister,
>> .ops =3D &xhci_usb_ops,
>> .of_match =3D xhci_brcm_ids,
>> .platdata_auto_alloc_size =3D sizeof(struct =
brcm_xhci_platdata),
>> .priv_auto_alloc_size =3D sizeof(struct xhci_ctrl),
>> .flags =3D DM_FLAG_ALLOC_PRIV_DMA,
>> };
>>=20
>> It is a new driver as of around 6 months ago and so is likely
>> the one created for the RPi4B context.
>>=20
>> (Note the usb_xhci vs. xhci_brcm distinct namings of
>> the driver.)
>>=20
>>=20
>> The .dtb files that I use for uefi/ACPI booting of FreeBSD
>> and for u-boot based booting of ubuntu 2010.04.1 also use
>> "generic-xhci", no "brcm," invovled.
>>=20
>> It seems that .dtb files that the u-boot folks expect for
>> the RPi4B are vintages/variations that have compatible
>> listing: "brcm,generic-xhci" .
>>=20
>> If one finds a .dtb with such, it might be close to what
>> they were testing. With such a file, finding other
>> differences with the .dtb files currently in use with
>> FreeBSD could be done.
>>=20
>> I hope that the above helps.
>=20
> Looks like the u-boot.bin built includes "xhci-pci"
> but excludes "brcm,generic-xhci": not in the output
> of hd /usr/local/share/u-boot/u-boot-rpi4/u-boot.bin
> after the port is installed.
>=20
> My initial guess would be that something more needs
> to be specified to cause drivers/usb/host/xhci-brcm.c
> (and possibly more) to be built and included.
Looks like that was a bad guess, it still gets:
No working controllers found
based on instead having the "brcm,generic-xhci"
driver (with a "generic-xhci" added to the
compatibility list).
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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