0545e9dc6d
commit d1edce71135cc6d98c0a4b5729774542b676e769 Author: sophgo-forum-service <forum_service@sophgo.com> Date: Fri Mar 15 16:07:33 2024 +0800 [fix] recommend using ssh method to clone repo. [fix] fix sensor driver repo branch name.
20 lines
956 B
Plaintext
20 lines
956 B
Plaintext
Broadcom introduced new bus as replacement for older SSB. It is based on AMBA,
|
|
however from programming point of view there is nothing AMBA specific we use.
|
|
|
|
Standard AMBA drivers are platform specific, have hardcoded addresses and use
|
|
AMBA standard fields like CID and PID.
|
|
|
|
In case of Broadcom's cards every device consists of:
|
|
1) Broadcom specific AMBA device. It is put on AMBA bus, but can not be treated
|
|
as standard AMBA device. Reading it's CID or PID can cause machine lockup.
|
|
2) AMBA standard devices called ports or wrappers. They have CIDs (AMBA_CID)
|
|
and PIDs (0x103BB369), but we do not use that info for anything. One of that
|
|
devices is used for managing Broadcom specific core.
|
|
|
|
Addresses of AMBA devices are not hardcoded in driver and have to be read from
|
|
EPROM.
|
|
|
|
In this situation we decided to introduce separated bus. It can contain up to
|
|
16 devices identified by Broadcom specific fields: manufacturer, id, revision
|
|
and class.
|