Re: Kernel Mbox To Pst Crack
Srikanth Fonseca
Hi Marco,
Responses to your questions:
(1) I think there is some confusion on the terms. We refer to the term "mailbox" as the name for the IP instance. There are 12 instances on the DRA7x family. Each IP instance has a number (16 on most) of unidirectional hardware fifos. Each Mailbox IP has 4 interrupt outputs, with each interrupt output used by a processor core (called a User, partitioning defined through software, so totally flexible). For example, if you are communicating between ARM and DSP1 and using Mailbox 10 IP instance, you can assign ARM as User 0 and DSP1 and User 1. You could have communications to a DSP2 using User 2, and using different FIFO pairs between all three processors. Please look through the Mailbox chapter in the TRM for additional details.
The three cells are explained well in the binding - first cell is the FIFO number, second cell is index of the interrupt to be used by MPU (from the interrupts property, so this will typically be same between ti,mbox-rx and ti,mbox-tx) and the third cell is the User id (I expect second cell and third cells to typically match value as the interrupts are listed in the same order as the 4 User interrupt outputs). Note that these assignments only define the Rx and Tx from MPU perspective. The exceptions to the typical usage is if you assign multiple User interrupts towards MPU and separate them out between Rx and Tx.
(3).(a) I am not quite sure I understand your question. mbox_request_channel_byname() is designed to be able to request a mailbox channel when your client DTS node has multiple mboxes defined in the "mboxes" property. The name you pass in should match one of the names used in the "mbox-names" property. The other API is by index into your "mboxes" property. If you will only have one mbox channel in your client, you can simply drop the "mbox-names" property and just use mbox_request_channel with index 0.
(3).(b) The mbox_channel is the name used by mailbox core to represent a communication channel registered by mailbox controllers/providers with the mailbox core. Each such channel can be uni-directional (requiring you to request two channels - one for Rx or Tx), or simply a duplex channel (requiring you to request only one channel which includes both Rx and Tx). The OMAP Mailbox channels follow the latter convention, and the driver actually doesn't support defining simplex channels. Your mbox_sms node under mailbox10 defines a duplex channel. The "ti,mbox-rx" and the "ti,mbox-tx" dictate your Rx and Tx FIFOs respectively from Linux-side.
regards
Suman
There are a number of websites sharing the same series of patchesI want to apply this series of patches [email protected]/What I would do is to copy past the patch and apply one by one but is that the only way? Is there another way to apply them ?
If you have the Linux source code as a Git repository, you should be able to download the 'mbox' file of the entire list thread (look for "Thread overview: mbox.gz"), then feed it to the git am command which applies all patches as individual Git commits.
To use it, all you need to know is the message-id of one of the patches in the thread you want to grab. Once you have that, you can use the lore.kernel.org archive to grab the whole thread and prepare an mbox file that is ready to be fed to git-am:
On top of that, b4 also introduces support for cryptographic patch attestation, which makes it possible to verify that patches (and their metadata) weren't modified in transit between developers. This is still an experimental feature, but initial tests have been pretty encouraging.
If you would like to submit attestation for a patch or a series of patches, the best time to do that is right after you use git send-email to submit your patches to the list. Simply run the following:
When running b4 am, the tool will automatically check if attestation is available by querying the signatures archive on lore.kernel.org. If it finds the attestation document, it will run gpg --verify on it. All of the following checks must pass before attestation is accepted:
In this configuration, they use the same channel numbers (channel number 1) both for remoteproc (imx8mp-cm7 dts node) and RPMsg (rpmsg dts node). For us, it did not work. The mailbox was allocating channels 1 to RPMsg and then it crashes (the kernel panic described in the original post) while trying to allocate those same channels for remoteproc ...
The Linux Kernel is under constant development and improvement. Everyday patches are submitted to the Linux Kernel Mailing List (LKML). Some of these patches get accepted and merged into the mainline Linux kernel and become available to the user, other patches never do.
Source code for the Linux kernel is available from it can be downloaded or cloned with git. When we go the to git repositories page one might feel overwhelmed by the number of repositories (there are hundreds of them).
When we identified a patch or a patch series that is of interest for us, there are several ways to apply them locally. For example this series of patches to the kernel that was written to fix some issues with the PCIe endpoint test driver. First find the patches you are interested in on Then on the thread summary you will find a link to a mbox.gz file as shown below
Depending on the version of the Linux kernel for which the patches have been developed and the version you currently work on there might be issues and patches might require edits. Some patches also have dependencies on other patches or require to be applied in a given order. This is often documented in the patch itself or the patch series cover letter. Patches in a given series are usually ordered so that they can be applied in that order. In our case here we were able to directly apply them. We can now compile the kernel with the new patches !
With this feel free to follow LKML of your interest and try out the latests patches as soon as they are submitted ! This allows you to test and play around with very new and experimental features or simply use/test drivers way before they become available in the mainline version of Linux.
A mailbox is a kernel object that provides enhanced message queuecapabilities that go beyond the capabilities of a message queue object.A mailbox allows threads to send and receive messages of any sizesynchronously or asynchronously.
A mailbox allows threads, but not ISRs, to exchange messages.A thread that sends a message is known as the sending thread,while a thread that receives the message is known as the receiving thread.Each message may be received by only one thread (i.e. point-to-multipoint andbroadcast messaging is not supported).
The life cycle of a message is straightforward. A message is created whenit is given to a mailbox by the sending thread. The message is then ownedby the mailbox until it is given to a receiving thread. The receiving threadmay retrieve the message data when it receives the message from the mailbox,or it may perform data retrieval during a second, subsequent mailbox operation.Only when data retrieval has occurred is the message deleted by the mailbox.
A sending thread can specify the address of the thread to which the messageis sent, or send it to any thread by specifying K_ANY.Likewise, a receiving thread can specify the address of the thread from whichit wishes to receive a message, or it can receive a message from any threadby specifying K_ANY.A message is exchanged only when the requirements of both the sending threadand receiving thread are satisfied; such threads are said to be compatible.
For example, if thread A sends a message to thread B (and only thread B)it will be received by thread B if thread B tries to receive a messagefrom thread A or if thread B tries to receive from any thread.The exchange will not occur if thread B tries to receive a messagefrom thread C. The message can never be received by thread C,even if it tries to receive a message from thread A (or from any thread).
Mailbox messages can be exchanged synchronously or asynchronously.In a synchronous exchange, the sending thread blocks until the messagehas been fully processed by the receiving thread. In an asynchronous exchange,the sending thread does not wait until the message has been receivedby another thread before continuing; this allows the sending thread to doother work (such as gather data that will be used in the next message)before the message is given to a receiving thread and fully processed.The technique used for a given message exchange is determinedby the sending thread.
The synchronous exchange technique provides an implicit form of flow control,preventing a sending thread from generating messages faster than they can beconsumed by receiving threads. The asynchronous exchange technique provides anexplicit form of flow control, which allows a sending thread to determineif a previously sent message still exists before sending a subsequent message.
A 32-bit value that is exchanged by the message sender and receiver,and whose meaning is defined by the application. This exchange isbi-directional, allowing the sender to pass a value to the receiverduring any message exchange, and allowing the receiver to pass a valueto the sender during a synchronous message exchange.
The message data size, in bytes. Set it to zero when sending an emptymessage, or when sending a message buffer with no actual data. Whenreceiving a message, set it to the maximum amount of data desired, or tozero if the message data is not wanted. The mailbox updates this field withthe actual number of data bytes exchanged once the message is received.
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