Date: Sat, 3 Oct 2020 13:01:15 -0700 From: Mark Millard <marklmi@yahoo.com> To: Robert Crowston <crowston@protonmail.com>, freebsd-arm <freebsd-arm@freebsd.org> Subject: lspci XHCI "Memory at" for RPi4 (u-boot based context): FreeBSD vs. ubuntu vs. "Memory behind bridge" addresses Message-ID: <8D837FD4-FC25-4D17-B008-141DC6A3D0FC@yahoo.com> References: <8D837FD4-FC25-4D17-B008-141DC6A3D0FC.ref@yahoo.com>
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[Be warned that I'm reporting differences that I do not
understand. I may end up being told "nothing of interest
in these differences".]
In the later lspci -v output diff, there is the following for
the XHCI (-: FreeBSD, +: ubuntu):
- Memory at f8000000 (64-bit, non-prefetchable)
. . .
+ Memory at 600000000 (64-bit, non-prefetchable) [size=3D4K]
Odder(?) is comparison of the FreeBSD address with what is
listed by both OS's for "Memory behind bridge":
Memory behind bridge: f8000000-f80fffff [size=3D1M]
. . .
- Memory at f8000000 (64-bit, non-prefetchable)
ubuntu gets a distinct address (600000000) and FreeBSD gets
an exact match to the start of the "Memory behind bridge".
(There may be a possible 32-bit address vs. 64-bit address
distinction?)
[There are also IRQ differences (81/82 for FreeBSD; 41/42 for
ubuntu) and ubuntu lists the kernel drivers used.]
For reference:
# diff -u ~/rpi4-lspci_v-*.txt | more
--- /root/rpi4-lspci_v-fbsd.txt 2020-10-03 12:19:57.162261000 -0700
+++ /root/rpi4-lspci_v-ubuntu.txt 2020-10-03 12:21:01.448646000 =
-0700
@@ -1,5 +1,5 @@
-00:00.0 PCI bridge: Broadcom Inc. and subsidiaries Device 2711 (prog-if =
00 [Normal decode])
- Flags: bus master, fast devsel, latency 0, IRQ 81
+00:00.0 PCI bridge: Broadcom Inc. and subsidiaries Device 2711 (rev 10) =
(prog-if 00 [Normal decode])
+ Flags: bus master, fast devsel, latency 0, IRQ 41
Bus: primary=3D00, secondary=3D01, subordinate=3D01, =
sec-latency=3D0
I/O behind bridge: 00000000-00000fff [size=3D4K]
Memory behind bridge: f8000000-f80fffff [size=3D1M]
@@ -9,13 +9,15 @@
Capabilities: [100] Advanced Error Reporting
Capabilities: [180] Vendor Specific Information: ID=3D0000 Rev=3D0=
Len=3D028 <?>
Capabilities: [240] L1 PM Substates
+ Kernel driver in use: pcieport
=20
01:00.0 USB controller: VIA Technologies, Inc. VL805 USB 3.0 Host =
Controller (rev 01) (prog-if 30 [XHCI])
Subsystem: VIA Technologies, Inc. VL805 USB 3.0 Host Controller
- Flags: bus master, fast devsel, latency 0, IRQ 82
- Memory at f8000000 (64-bit, non-prefetchable)
+ Flags: bus master, fast devsel, latency 0, IRQ 42
+ Memory at 600000000 (64-bit, non-prefetchable) [size=3D4K]
Capabilities: [80] Power Management version 3
Capabilities: [90] MSI: Enable+ Count=3D1/4 Maskable- 64bit+
Capabilities: [c4] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
+ Kernel driver in use: xhci_hcd
=20
Is this odd? Expected/reasonable?
=3D=3D=3D
Mark Millard
marklmi at yahoo.com
( dsl-only.net went
away in early 2018-Mar)
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