On 1/6/25 7:17 AM, Alice Guo (OSS) wrote:
On 1/3/25 7:45 AM, Alice Guo wrote:
From: Viorel Suman <viorel.su...@nxp.com>
When interrupt driven communication is supported
U-Boot does not use interrupts.
, the transport allows
the caller to choose between interrupt and polling driven
communications. To make the choice, the channel flags are used. i.MX95
uses interrupt driven communication so that Channel flags should be
set to 1.
How does this work in U-Boot, which does not use interrupts ?
Hi Marek,
The clearer explanation will be added in the commit log.
This is based on Arm® System Control and Management Interface Platform Design
Document Version 3.2 (Document number: DEN0056E) 5.1.2. When Bit[0] of Channel
flags is 1, the System Manager runs on M core will trigger general-purpose
interrupts to A core. U-Boot polls General-purpose Status (GSR) until GIPn is
set.
If U-Boot does polling, why does this bit need to be set, shouldn't the
bit be cleared instead ?
