Use the rM kernel sources

[Eeems]

Have you looked at using the rM kernel sources instead of upstream?

[timower]

Right, I tried at the start, but there was a bug that prevented them from being compiled on my host machine.
As I'm using docker anyway now, this should just work.

Ideally we'd also create a qemu machine that closely matches the remarkable. Then we could use the rM device tree as well.

[timower]

Doesn't seem to compile:

131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `imx6_pcie_start_link':
131.0 pci-imx6.c:(.text+0xbf8): undefined reference to `dw_pcie_link_up'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `pci_imx_set_msi_en':
131.0 pci-imx6.c:(.text+0xe48): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xe5c): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xe6c): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xe88): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xe98): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xeb0): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `imx6_pcie_set_l1_latency':
131.0 pci-imx6.c:(.text+0xee4): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xef8): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xf38): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xf50): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `pcie_phy_wait_ack':
131.0 pci-imx6.c:(.text+0xf84): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xf98): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xfb8): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0xff4): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x1014): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `pcie_phy_read':
131.0 pci-imx6.c:(.text+0x1084): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x10a4): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x10e0): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x1100): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x1118): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `pcie_phy_write':
131.0 pci-imx6.c:(.text+0x27cc): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x27e0): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2800): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2840): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2860): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x289c): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x28bc): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x28f4): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2914): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2948): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `imx6_pcie_establish_link':
131.0 pci-imx6.c:(.text+0x298c): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x29a0): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x29b0): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x29c8): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x29d8): undefined reference to `dw_pcie_wait_for_link'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x29fc): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a18): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a28): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a3c): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a4c): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a68): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a78): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2a8c): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2aa4): undefined reference to `dw_pcie_wait_for_link'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2abc): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2ad0): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2ae0): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2b50): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2b88): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x2b9c): undefined reference to `dw_pcie_write_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: drivers/pci/controller/dwc/pci-imx6.o: in function `imx6_pcie_probe':
131.0 pci-imx6.c:(.text+0x33c8): undefined reference to `dw_pcie_read_dbi'
131.0 /opt/x-tools/arm-remarkable-linux-gnueabihf/bin/arm-linux-gnueabihf-ld.bfd: pci-imx6.c:(.text+0x33dc): undefined reference to `dw_pcie_write_dbi'
131.2 make[1]: *** [/opt/linux/Makefile:1103: vmlinux] Error 1
131.2 make[1]: Leaving directory '/opt/linux/imx7'
131.2 make: *** [Makefile:179: sub-make] Error 2

We'd probably have to disable PCI support

[Eeems]

What tag are you building?

[Eeems]

@timower poke?

[timower]

I was using rm1xx_5.4.70_v1.3.x, I got a bit further by disabling PCI.
But it seems like remarkable isn't using upstream imx drivers, which don't support qemu.
It hangs on startup, without any log messages. Same when I use the zImage from the firmware image.

Next step is attaching gdb to see where it hangs, but I'm not sure it's worth the effort.

[Eeems]

Oh, are you trying to build the kernel with the toltec toolchain? It might be missing things required to build the kernel. You could try building with the official toolchain instead: https://remarkable.guide/devel/toolchains.html#docker

That said, we would still run into the same issue with imx. I did a bit of poking online and found the following:
https://stackoverflow.com/a/57818584

This leads me to https://git.iostud.io/pciavald/remarkable-dev, which is interesting.

It may be worth writing the custom code required to add a rM machine configuration to qemu at some point.