ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux
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<milkylainen>
Anyone know if the ASUS tinkerboard has a full mini-pcie slot or just USB? They don't make any claims of supporting mini-pcie. But the formfactor is minipcie and the AW-cb375nf module (wifi/bt) looks like it's attached to both pcie and usb...
<milkylainen>
tinkerboard 2/s
<geertu>
milkylainen: It's a M2 slot? From counting the pins and looking where the key is, you should be able to find out the type of slot and signals, right?
<milkylainen>
geertu: ah. yes, it's an m.2 slot.. hmm.
<milkylainen>
ASUS doesn't seem to list the m.2 on the i/o list. Maybe have to dig deeper. Strange anyway.
<apritzel>
milkylainen: so the PCIe link is there, but it's only 1 lane (out of the four from the SoC)
<apritzel>
milkylainen: and the 2nd PCIe x1 link of the M2.E connector is not connected (this would require an extra PCIe switch on the board)
<milkylainen>
Mkay.
<milkylainen>
Looking for a aarch64 board that has pcie expansion in the 1.8" (typically RPi-sized) formfactor. M.2 might work.
<milkylainen>
I have an DFI-GHF51 on the x86 side with an AMD R1000 (R1606G). Looking for something similar on the ARM side.
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<ajb-linaro>
I'm having an issue trying to reconcile the Pi4 memory map - basically is the kernel expecting to use the physical address for peripherals and is that 0xfe000000 or 0x7f000000
<ajb-linaro>
sorry 0x7e000000
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* ajb-linaro
finds the BCM2711 datasheet and is further confused....
<ardb>
ajb-linaro: like a david lynch film?
<ajb-linaro>
the datasheet lists the peripheral base as 0x7c000000 (Legacy Master view) or 0x47c000000 (Full 35-bit address map) or 0xfc000000 (Address map in "Low Peripheral Mode"")
<ardb>
iirc it reasons from the GPU's pov in most cases
<ajb-linaro>
ardb: the older docs talked about the VC view, bus view and ARM virtual address... the "Low Peripheral" mode is referred to as the ARM view
<ajb-linaro>
ardb: does the kernel do any re-mapping for kernel-mode access or is it always essentially the ARM physical address?
<ardb>
ajb-linaro: in general, it remaps everything
<ajb-linaro>
ardb: but the DTB is in terms of ARM physical address?
<apritzel>
ajb-linaro: with the MMU off it's definitely 0xfe000000 on the RPi4 from the ARM cores, as described in the DTB
<ardb>
yes
<ajb-linaro>
ardb: my DTB says for example serial0 = "/soc/serial@7e215040";
<apritzel>
ajb-linaro: follow the white rabbit called "ranges"