On 18/05/2018 14:18, Tom Rini wrote:
> On Fri, May 18, 2018 at 02:06:08PM +0100, Grant Likely wrote:
>
>> Use reStructuredText citation markup to capture all referenced
>> documents. Sphinx will take care of creating a table of references at
>> the end of the document.
>>
>> Fixes #6
>> Signed-off-by: Grant Likely <grant.likely(a)arm.com>
> [snip]
>> @@ -132,22 +115,11 @@ This document defines the boot and runtime services that are expected by an
>> Operating System or hypervisor, for an ARM embedded device, which follows the
>> UEFI specification.
>>
>> -This document references the following specification and versions:
>> -
>> - UEFI 2.7
>> - Published June 2017, includes the AArch64 bindings.
>> -
>
> Is it clear enough when rendering the final document that here we don't
> need a link down to the UEFI reference?
Not sure what you mean. Can you elaborate?
I do think the introduction chapter needs to be reworked anyway to talk
about standardizing the firmware interface. It too quickly jumps to
"when UEFI is chosen", when what I'd rather it present is "here is a
standardized platform taylored to embedded systems"... and then get to
UEFI is part of that standard.
(it isn't about chosing UEFI; it is about choosing a standard platform)
>
>> This specification defines the boot and runtime services for a physical system,
>> including services that are required for virtualization.
>> It does not define a standardized abstract virtual machine view for a Guest
>> Operating System.
>>
>> -When present with in a system, this document makes additional references to the
>> -Power State Coordination Interface:
>> -
>> - PSCI 1.1
>> - Published April 2017.
>> -
> [snip]
>> @@ -306,9 +278,10 @@ command:
>>
>> - EfiWarmReset()
>>
>> -.. note:: When Runtime Services and PSCI co-exist, it is anticipated that
>> - Operating System calls to reset the system will go via Runtime Services and
>> - not directly to PSCI.
>> +.. note:: On platforms implementing the Power State Coordination Interface
>> + specification[PSCI_], it is still required that EBBR compliant
>> + Operating Systems calls to reset the system will go via Runtime Services
>> + and not directly to PSCI.
>>
>> Set Variable
>> ------------
>
> Is all of the above equivalent in terms of talking about PSCI? Thanks!
Ummm, yes? But I'm not sure that I understand what you're asking.
Thanks for the reviews on all the other patches.
g.
I'm adding some EBBR text around the CPU state at boot and I've lost
track of what is being done for multicore bringup. What is the current
state-of-the-art for multicore boot protocol when PSCI isn't available?
SBBR allows for the MP Boot Protocol; with the intend of phasing it out:
https://acpica.org/sites/acpica/files/MP%20Startup%20for%20ARM%20platforms.…
The kernel documents the spin table method:
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/tre…
What are the cool kids currently doing here?
g.
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On the weekly call today I suggested for people to assign issues to
themselves if they wanted to take it on. Turns out GitHub doesn't allow
that unless you've got write access to the project. So, if you want to
take on an issue, add a comment saying so and I'll send you an invite to
join the project.
Once you've accepted the invite I can assign issues to you.
g.
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Deferred probe will currently wait forever on dependent devices to probe,
but sometimes a driver will never exist. It's also not always critical for
a driver to exist. Platforms can rely on default configuration from the
bootloader or reset defaults for things such as pinctrl and power domains.
This is often the case with initial platform support until various drivers
get enabled. There's at least 2 scenarios where deferred probe can render
a platform broken. Both involve using a DT which has more devices and
dependencies than the kernel supports. The 1st case is a driver may be
disabled in the kernel config. The 2nd case is the kernel version may
simply not have the dependent driver. This can happen if using a newer DT
(provided by firmware perhaps) with a stable kernel version.
Unfortunately, this change breaks with modules as we have no way of
knowing when modules are done loading. One possibility is to make this
opt in or out based on compatible strings rather than at a subsystem level.
Ideally this information could be extracted automatically somehow. OTOH,
maybe the lists are pretty small. There's only a handful of subsystems
that can be optional, and then only so many drivers in those that can be
modules (at least for pinctrl, many drivers are built-in only).
Cc: Alexander Graf <agraf(a)suse.de>
Signed-off-by: Rob Herring <robh(a)kernel.org>
---
This patch came out of a discussion on the ARM boot-architecture
list[1] about DT forwards and backwards compatibility issues. There are
issues with newer DTs breaking on older, stable kernels. Some of these
are difficult to solve, but cases of optional devices not having
kernel support should be solvable.
I tested this on a RPi3 B with the pinctrl driver forced off. With this
change, the MMC/SD and UART drivers can function without the pinctrl
driver.
Rob
[1] https://lists.linaro.org/pipermail/boot-architecture/2018-April/000466.html
drivers/base/dd.c | 16 ++++++++++++++++
drivers/pinctrl/devicetree.c | 2 +-
include/linux/device.h | 2 ++
3 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index c9f54089429b..5848808b9d7a 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -226,6 +226,15 @@ void device_unblock_probing(void)
driver_deferred_probe_trigger();
}
+
+int driver_deferred_probe_optional(void)
+{
+ if (initcalls_done)
+ return -ENODEV;
+
+ return -EPROBE_DEFER;
+}
+
/**
* deferred_probe_initcall() - Enable probing of deferred devices
*
@@ -240,6 +249,13 @@ static int deferred_probe_initcall(void)
/* Sort as many dependencies as possible before exiting initcalls */
flush_work(&deferred_probe_work);
initcalls_done = true;
+
+ /*
+ * Trigger deferred probe again, this time we won't defer anything
+ * that is optional
+ */
+ driver_deferred_probe_trigger();
+ flush_work(&deferred_probe_work);
return 0;
}
late_initcall(deferred_probe_initcall);
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c
index b601039d6c69..096e52a5c506 100644
--- a/drivers/pinctrl/devicetree.c
+++ b/drivers/pinctrl/devicetree.c
@@ -120,7 +120,7 @@ static int dt_to_map_one_config(struct pinctrl *p,
np_config);
of_node_put(np_pctldev);
/* OK let's just assume this will appear later then */
- return -EPROBE_DEFER;
+ return driver_deferred_probe_optional();
}
/* If we're creating a hog we can use the passed pctldev */
if (pctldev && (np_pctldev == p->dev->of_node))
diff --git a/include/linux/device.h b/include/linux/device.h
index 0059b99e1f25..8de920442bc1 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -332,6 +332,8 @@ struct device *driver_find_device(struct device_driver *drv,
struct device *start, void *data,
int (*match)(struct device *dev, void *data));
+int driver_deferred_probe_optional(void);
+
/**
* struct subsys_interface - interfaces to device functions
* @name: name of the device function
--
2.17.0
I've started tracking EBBR issues in github, so I will no longer track
them in the weekly meeting notes document. Please go take a look. Feel
free to add issues for things that need to be done, or comment on the
items that are there.
Better yet, write patches to fix the existing issues! ;-)
https://github.com/ARM-software/ebbr/issues
Cheers,
g.
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Replace the LICENSE file with the full text of CC-BY-SA 4.0 License into
the LICENSE file, and move the DCO description into the README.
The LICENSE file is a verbatim copy of:
https://creativecommons.org/licenses/by-sa/4.0/legalcode.txt
Signed-off-by: Grant Likely <grant.likely(a)arm.com>
---
LICENSE | 428 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
LICENSE.rst | 50 -------
README.rst | 75 ++++++++---
3 files changed, 488 insertions(+), 65 deletions(-)
create mode 100644 LICENSE
delete mode 100644 LICENSE.rst
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..fe8dbc5
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+++ b/LICENSE
@@ -0,0 +1,428 @@
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deleted file mode 100644
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- person who certified (a), (b) or (c) and I have not modified
- it.
-
- (d) I understand and agree that this project and the contribution
- are public and that a record of the contribution (including all
- personal information I submit with it, including my sign-off) is
- maintained indefinitely and may be redistributed consistent with
- this project or the open source license(s) involved.
diff --git a/README.rst b/README.rst
index 84aeb0a..1babcf4 100644
--- a/README.rst
+++ b/README.rst
@@ -13,11 +13,21 @@ expected in September 2018. You can find the current draft text in this
repository, but be aware that everything in the draft text is subject to
change before an official v1.0 release is published.
-The documentation in this project is provided under the terms of the
-Creative Commons Attribution Share-Alike License.
-Licensing details can be found in the LICENSE.rst_ file.
+License
+=======
-.. _LICENSE.rst: ./LICENSE.rst
+This work is licensed under the Creative Commons Attribution-ShareAlike 4.0
+International License. To view a copy of this license, visit
+http://creativecommons.org/licenses/by-sa/4.0/ or send a letter to
+Creative Commons, PO Box 1866, Mountain View, CA 94042, USA.
+
+A copy of the license is included in the LICENSE_ file.
+
+.. image:: https://i.creativecommons.org/l/by-sa/4.0/88x31.png
+ :target: http://creativecommons.org/licenses/by-sa/4.0/
+ :alt: Creative Commons License
+
+.. _LICENSE: ./LICENSE
Contributing
============
@@ -25,29 +35,64 @@ Contributing
Master copy of this project is hosted on GitHub:
https://github.com/ARM-software/ebbr
-Anyone may contribute to EBBR. Contributions must be made with a
-Developer Certificate of Origin (DCO_) attestation that the contribution
-confirms to the license of the project. The attestation is made by the
-developer including a ``Signed-off-by: <email-address>`` tag in the
-commit text of the contribution.
-
-EBBR discussion is on the boot-architecture_ and arm.ebbr-discuss mailing lists.
-The 'official' list is arm.ebbr-discuss, but the list archives are not yet public,
-so boot-architecture_ is being used to keep everything in the open.
+Anyone may contribute to the EBBR project. EBBR discussion uses the
+boot-architecture_ and arm.ebbr-discuss mailing lists.
+The 'official' list is arm.ebbr-discuss, but the list archives are not
+yet public, so boot-architecture_ is being used to keep everything in
+the open.
* boot-architechture(a)lists.linaro.org
* arm.ebbr-discuss(a)arm.com
-Past discussions can be found in the _boot-architecture-archive.
+Past discussions can be found in the boot-architecture-archive_.
+
+To help track the origin of contributions, this project uses the same
+DCO_ "sign-off" process as used by the Linux kernel.
+The sign-off is a simple line at the end of the explanation for the
+patch, which certifies that you wrote it or otherwise have the right to
+pass it on as an open-source patch. The rules are pretty simple: if you
+can certify the below:
+
+Developer's Certificate of Origin 1.1
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+By making a contribution to this project, I certify that:
+
+ (a) The contribution was created in whole or in part by me and I
+ have the right to submit it under the open source license
+ indicated in the file; or
+
+ (b) The contribution is based upon previous work that, to the best
+ of my knowledge, is covered under an appropriate open source
+ license and I have the right under that license to submit that
+ work with modifications, whether created in whole or in part
+ by me, under the same open source license (unless I am
+ permitted to submit under a different license), as indicated
+ in the file; or
+
+ (c) The contribution was provided directly to me by some other
+ person who certified (a), (b) or (c) and I have not modified
+ it.
+
+ (d) I understand and agree that this project and the contribution
+ are public and that a record of the contribution (including all
+ personal information I submit with it, including my sign-off) is
+ maintained indefinitely and may be redistributed consistent with
+ this project or the open source license(s) involved.
+
+then you just add a line saying::
+
+ Signed-off-by: Random J Developer <random(a)developer.example.org>
IRC Channel: ``#ebbr`` on ofct
.. _DCO: https://developercertificate.org/
.. _boot-architecture: https://lists.linaro.org/mailman/listinfo/boot-architecture
-.. _boot-architecture-archive: https://lists.linaro.org/pipermail/boot-architecture/
+.. _boot-architecture-archive: https://lists.linaro.org/pipermail/boot-architecture
Writers Guide
=============
+
All documentation in this repository uses reStructuredText_ markup
with Sphinx_ extensions.
--
2.13.0
Hi folks,
Internal approval for EBBR has come through and we now have a GitHub
repo. It's empty at the moment, but I'll be pushing the current EBBR
text there shortly once I've fixed the license text.
License will be CC-BY-SA
https://github.com/ARM-software/ebbr
We can start using this page to track issue. I'll put all the active
action items into github issues.
Cheers,
g.
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