RPi4B: emmc2bus dma-range handling does not track the boot-time-FDT (u-boot based booting)
Mark Millard
marklmi at yahoo.com
Fri Oct 9 04:29:32 UTC 2020
On 2020-Oct-8, at 20:06, Mark Millard <marklmi at yahoo.com> wrote:
> On 2020-Oct-8, at 06:27, Klaus Cucinauomo <maciphone2 at googlemail.com> wrote:
>
>>> Am 08.10.2020 um 11:01 schrieb Mark Millard via freebsd-arm <freebsd-arm at freebsd.org>:
>>>
>>>
>>> The old u-boot/DTB combination in use does not have emmc2bus.
>>> And, even if it did, FreeBSD would not use ……….
>>
>> … and the new 2020.10- combinations will even be more annoying…
>> 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
>> (depending on hw-revisions)…and 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
>> for a time period… other than leaving it crappy as is and to be happy that it nevertheless
>> is a working fbsd-gadget :-)
>
>
> Summary of probable-cause finding: u-boot 2020.10 is
> expecting:
>
> compatible = "brcm,generic-xhci"
>
> instead of what seems to be in files that are in use
> by FreeBSD:
>
> compatible = "generic-xhci"
>
> (I've no clue what all the other differences in the .dtb
> file contents might be.)
>
>
>
> The details of what I learned that reached that status . . .
>
> 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.
>
> That 8 GiByte RPi4B context booted just fine.
>
> I then rebooted and had it stop in u-boot and looked around just a little
> bit.
>
> U-Boot 2020.10 (Oct 09 2020 - 00:51:29 +0000)
>
> DRAM: 7.9 GiB
> RPI 4 Model B (0xd03114)
> MMC: mmc at 7e300000: 1, emmc2 at 7e340000: 0
> Loading Environment from FAT... In: serial
> Out: vidconsole
> Err: vidconsole
> Net: eth0: ethernet at 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
>
> So it reproted the problem above. Yet . . .
>
> 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
>
> U-Boot> pci 1
> Scanning PCI devices on bus 1
> BusDevFun VendorId DeviceId Device Class Sub-Class
> _____________________________________________________________
> 01.00.00 0x1106 0x3483 Serial bus controller 0x03
>
> So it does see the xHCI on the pci bus despite the
> "Bus xhci_pci: probe failed, error -110". -110 looks
> to be -ETIMEDOUT .
>
> Looking at the v2020.10/drivers/usb/host/xhci-pci.c source
> code shows that the xhci_pci driver has:
>
> . . .
> static const struct udevice_id xhci_pci_ids[] = {
> { .compatible = "xhci-pci" },
> { }
> };
>
> U_BOOT_DRIVER(xhci_pci) = {
> .name = "xhci_pci",
> .id = UCLASS_USB,
> .probe = xhci_pci_probe,
> .remove = xhci_deregister,
> .of_match = xhci_pci_ids,
> .ops = &xhci_usb_ops,
> .platdata_auto_alloc_size = sizeof(struct usb_platdata),
> .priv_auto_alloc_size = sizeof(struct xhci_ctrl),
> .flags = DM_FLAG_ALLOC_PRIV_DMA,
> };
>
> static struct pci_device_id xhci_pci_supported[] = {
> { PCI_DEVICE_CLASS(PCI_CLASS_SERIAL_USB_XHCI, ~0) },
> {},
> };
>
> U_BOOT_PCI_DEVICE(xhci_pci, xhci_pci_supported);
>
> (It looks like the above driver is used as the default
> driver if no explicit match is found. It has been around
> for years.)
>
>
> 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:
>
> xhci at 7e9c0000 {
> compatible = "generic-xhci";
> status = "disabled";
> reg = <0x00000000 0x7e9c0000 0x00000000 0x00100000>;
> interrupts = <0x00000000 0x000000b0 0x00000004>;
> phandle = <0x000000d3>;
> };
>
> For reference, for FreeBSD there is:
>
> # 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 = "generic-xhci";
> /usr/src/sys/gnu/dts/arm/bcm5301x.dtsi: compatible = "generic-xhci";
> /usr/src/sys/gnu/dts/arm64/broadcom/stingray/stingray-usb.dtsi: compatible = "generic-xhci";
> /usr/src/sys/gnu/dts/arm64/broadcom/stingray/stingray-usb.dtsi: compatible = "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";
>
> That FreeBSD generic_xhci_fdt.c match is from:
>
> static struct ofw_compat_data compat_data[] = {
> {"marvell,armada-380-xhci", true},
> {"marvell,armada3700-xhci", true},
> {"marvell,armada-8k-xhci", true},
> {"generic-xhci", true},
> {NULL, false}
> };
>
> (End for-reference.)
>
> There is another driver in u-boot 2020.10, one that
> does mention "generic-" for xhci in
> drivers/usb/host/xhci-brcm.c :
>
> static const struct udevice_id xhci_brcm_ids[] = {
> { .compatible = "brcm,generic-xhci" },
> { }
> };
>
> U_BOOT_DRIVER(usb_xhci) = {
> .name = "xhci_brcm",
> .id = UCLASS_USB,
> .probe = xhci_brcm_probe,
> .remove = xhci_brcm_deregister,
> .ops = &xhci_usb_ops,
> .of_match = xhci_brcm_ids,
> .platdata_auto_alloc_size = sizeof(struct brcm_xhci_platdata),
> .priv_auto_alloc_size = sizeof(struct xhci_ctrl),
> .flags = DM_FLAG_ALLOC_PRIV_DMA,
> };
>
> It is a new driver as of around 6 months ago and so is likely
> the one created for the RPi4B context.
>
> (Note the usb_xhci vs. xhci_brcm distinct namings of
> the driver.)
>
>
> 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.
>
> It seems that .dtb files that the u-boot folks expect for
> the RPi4B are vintages/variations that have compatible
> listing: "brcm,generic-xhci" .
>
> 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.
>
> I hope that the above helps.
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.
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.
===
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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