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| XHCI: Endpoint Ring does not work on real hardware https://forum.osdev.org/viewtopic.php?f=1&t=42614 |
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| Author: | SanderR [ Thu Apr 08, 2021 12:47 pm ] |
| Post subject: | XHCI: Endpoint Ring does not work on real hardware |
Hello everyone, I am working on XHCI again and I was trying to make the XHCI driver work on real hardware. I managed to make it working untill the point that I want to get the GET_DESCRIPTOR command. In the emulator, it does exactly what I want: an object is placed on the event ring and there is a value in the buffer. On real hardware, nothing seems to happen. I decided to make a dump of the element the XHCI hardware made for the bcbaap and everything is 0 except Context Entries which is 1, Root hub port number,which is 1, Speed which is 4 and slotstate which is 1. I got the feeling I am doing something wrong, but I have no idea what I did wrong and if there is any good debugging tool for this. The following link goes to the code and to the location where I do the action: https://github.com/AdeRegt/SanderOSUSB/ ... ci.c#L1041 I hope someone can tell me what I am doing wrong. Thank you in advantage! |
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| Author: | Candy [ Wed Aug 04, 2021 3:34 pm ] |
| Post subject: | Re: XHCI: Endpoint Ring does not work on real hardware |
Your repo is still private. Not sure if I can help with this really... |
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| Author: | SanderR [ Mon Aug 09, 2021 5:57 am ] |
| Post subject: | Re: XHCI: Endpoint Ring does not work on real hardware |
Thank you for checking out on this post. I closed the branch(this is why it looked like a private project) but this is the latest branch for this issue: https://github.com/AdeRegt/SanderOSUSB/ ... dev/xhci.c I found out that on real hardware the doorbell is working on this endpoint ring. but it returns a error and floods my system with interrupts without a number in USBSTS. I try to do it without interrupts, as you can see in the code. I hope you can help me seeing what is wrong. Thanks. |
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