Softboot; Softboot Messaging; Softboot Procedure; Table 2-6. Softboot Message - Cirrus Logic CS485 Series User Manual

2.5 Softboot

The O/S application code for the
without the need for re-download of the entire overlay stack. This is helpful for reducing the time required for
switching between different types of incoming audio data streams.
The Softboot procedure includes initial messaging that sends the
can boot the
CS485xx
includes a soft reset of the
software configuration messages.

2.5.1 Softboot Messaging

Two messages are relevant to the softboot procedure for the
and SOFTBOOT_ACK.
The SOFTBOOT message is sent from the host controller to the
system requires swapping of overlays.
The SOFTBOOT_ACK is sent from the
the with the new overlays.
CS485xx

2.5.2 Softboot Procedure

Figure 2-4 describes the Softboot procedure. This is a step-by-step guideline that can be used as an aid in
developing the system controller code required to drive the
DS734UM7
allows users to swap out one or more overlays during run time,
CS485xx
with different overlays according to the boot methods described in this chapter. This
, which then requires that the host send or re-send the hardware and
CS485xx

Table 2-6. SOFTBOOT Message

Mnemonic
SOFTBOOT
CS485xx
Table 2-7. SOFTBOOT_ACK Message
Mnemonic
SOFTBOOT_ACK
Copyright 2009 Cirrus Logic, Inc.
CS485xx
. These messages are: SOFTBOOT
CS485xx
CS485xx
Value
0x81000009
0x00000001
to the host controller to indicate that the host can now boot
Value
0x00000005
.
CS485xx
CS485xxr Hardware User's Manual
into a boot state where the host
to indicate to the
CS485xx
Softboot
that the
2-8