Hi Laszlo,
This is what is happening. When I boot the system and run 'devtree' shell
command, I get the following. Parent @7A and child @7B.
Ctrl[33] PciRoot(0x2)
Ctrl[78] PciRoot(0x2)/Pci(0x1,0x0)
Ctrl[79] PciRoot(0x2)/Pci(0x2,0x0)
Ctrl[7A] PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)
Ctrl[7B] PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)/MAC(121212121212,0x1)
Then I issue 'disconnect 7A' command and see the following.
Ctrl[33] PciRoot(0x2)
Ctrl[78] PciRoot(0x2)/Pci(0x1,0x0)
Ctrl[79] PciRoot(0x2)/Pci(0x2,0x0)
Ctrl[7A] PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)
Then I issue 'connect 7A' and see the following from 'devtree' command.
Ctrl[33] PciRoot(0x2)
Ctrl[78] PciRoot(0x2)/Pci(0x1,0x0)
Ctrl[79] PciRoot(0x2)/Pci(0x2,0x0)
Ctrl[7A] PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)
Ctrl[89] PciRoot(0x2)/Pci(0x2,0x0)/Pci(0x0,0x0)/MAC(121212121212,0x1)
Now if I issue 'connect 89', then the MNP Support function will get called to
bind the MNP driver to the SNP protocol produced by '89'.
Looks to me, that connecting the parent does not result in child handles being
connected recursively. This can happen if the child counting loop that is
looking for protocol opened by child does not see the protocol opened by child.
Narinder Dhillon
From: nd6...@hotmail.com
To: edk2-devel@lists.sourceforge.net
Date: Thu, 7 Aug 2014 22:08:46 +0000
Subject: Re: [edk2] UEFI Shell Command "ifconfig" Error
Hi Laszlo,
I don't understand. When I break into UEFI shell, and run 'dh', I can see
device driver handles. This means that 'BdsConnectAllDrivers' was called and
that in turn called 'CoreConnectController'. Now the question is, if a driver
generates a child handle, 'CoreConnectController' should be called on that
child handle. From the code, I see that is only possible if protocol has not
been opened by child handle.
What do you think ?
Date: Thu, 7 Aug 2014 23:29:46 +0200
From: ler...@redhat.com
To: edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] UEFI Shell Command "ifconfig" Error
On 08/07/14 23:05, Chris Cuthbert wrote:
> This is ARM from edk2. All open source, nothing proprietary.
Ah. Yes. I recall that. Actually I have a downstream hack that is
related. I'll attach it just as illustration (the other tree patches
just increase the convenience). The point is (IIRC!) that ARM BDS does
not call BdsConnectAllDrivers() before reaching the boot menu. I guess
that's probably the issue.
In my case I wanted to auto-generate a boot option (for the boot menu)
for whatever disk partition that looked like an EFI System Partition.
The disk in question that I had was a virtio-blk disk, and the patch
didn't work initially. The reason was that at that point the disk had
not been connected yet. So, IMHO you can solve this by inserting a call
to BdsConnectAllDrivers() in a strategic point. You should probably find
that point yourself; for me it was DefineDefaultBootEntries().
(Note: I haven't tested this patch in a while, but the above was
certainly the case when I last run it.)
Laszlo
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