barebox qemu-malta pci problem
Lucas Stach
l.stach at pengutronix.de
Thu Apr 2 01:57:43 PDT 2015
Am Donnerstag, den 02.04.2015, 00:54 +0300 schrieb Antony Pavlov:
> Hi!
>
> It looks like qemu-malta barebox pci support is broken since
>
> commit b8a1bb1dd215770670108fe5b0de0e5e137bf8fd
> Author: Lucas Stach <dev at lynxeye.de>
> Date: Sat Oct 4 19:40:12 2014 +0200
>
> pci: defer device registration until after bridge setup
>
> Otherwise the drivers for a device may probe before the
> devices parent bridge is fully configured, which leads
> to errors when accessing the BARs.
>
Thanks for the report and the detailed reproducer. I'll have a look at
this.
Regards,
Lucas
> How to reproduce the problem:
>
> $ cd barebox.git
> $ export ARCH=mips
> $ export CROSS_COMPILE=<your favorite mips cross-compiler prefix>
>
> # first let's see working state
>
> $ git checkout b8a1bb1dd215770670108fe5b0de0e5e137bf8fd^
> $ make qemu-malta_defconfig && make clean && make
> $ qemu-system-mips -nodefaults -M malta -m 256 -nographic -serial stdio -monitor null -bios barebox-flash-image -net nic,model=rtl8139
>
> ...
>
> barebox:/ devinfo
>
> ...
>
> `-- i2c
> `-- pci
> `-- pci0
> `-- pci1
> `-- pci2
> `-- pci3
> `-- pci4
> `-- eth0
> `-- miibus0
> `-- fs
>
> <stop qemu emulation (ctrl-c)>
>
> # devinfo shows eth0 device on pci4. good.
> # now let's see broken state
>
> $ git checkout b8a1bb1dd215770670108fe5b0de0e5e137bf8fd
> $ make qemu-malta_defconfig && make clean && make
> $ qemu-system-mips -nodefaults -M malta -m 256 -nographic -serial stdio -monitor null -bios barebox-flash-image -net nic,model=rtl8139
>
> ...
>
> barebox:/ devinfo
>
> ...
>
> `-- i2c
> `-- pci
> `-- fs
>
> # As you can see there is no pci devices on pci bus.
>
> --
> Best regards,
> Antony Pavlov
--
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Industrial Linux Solutions | http://www.pengutronix.de/ |
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