100 lines
4.3 KiB
Plaintext
100 lines
4.3 KiB
Plaintext
------------------------------
|
|
SRIO Boot on Corenet Platforms
|
|
------------------------------
|
|
|
|
For some PowerPC processors with SRIO interface, boot location can be configured
|
|
to SRIO by RCW. The processor booting from SRIO can do without flash for u-boot
|
|
image, ucode and ENV. All the images can be fetched from another processor's
|
|
memory space by SRIO link connected between them.
|
|
|
|
This document describes the processes based on an example implemented on P4080DS
|
|
platforms and a RCW example with boot from SRIO configuration.
|
|
|
|
Environment of the SRIO boot:
|
|
a) Master and slave can be SOCs in one board or SOCs in separate boards.
|
|
b) They are connected with SRIO links, whether 1x or 4x, and directly or
|
|
through switch system.
|
|
c) Only Master has NorFlash for booting, and all the Master's and Slave's
|
|
U-Boot images, UCodes will be stored in this flash.
|
|
d) Slave has its own EEPROM for RCW and PBI.
|
|
e) Slave's RCW should configure the SerDes for SRIO boot port, set the boot
|
|
location to SRIO, and holdoff all the cores.
|
|
|
|
---------- ----------- -----------
|
|
| | | | | |
|
|
| | | | | |
|
|
| NorFlash|<----->| Master | SRIO | Slave |<---->[EEPROM]
|
|
| | | |<===========>| |
|
|
| | | | | |
|
|
---------- ----------- -----------
|
|
|
|
The example based on P4080DS platform:
|
|
Two P4080DS platforms can be used to implement the boot from SRIO. Their SRIO
|
|
ports 1 will be connected directly and will be used for the boot from SRIO.
|
|
|
|
1. Slave's RCW example for boot from SRIO port 1 and all cores in holdoff.
|
|
00000000: aa55 aa55 010e 0100 0c58 0000 0000 0000
|
|
00000010: 1818 1818 0000 8888 7440 4000 0000 2000
|
|
00000020: f440 0000 0100 0000 0000 0000 0000 0000
|
|
00000030: 0000 0000 0083 0000 0000 0000 0000 0000
|
|
00000040: 0000 0000 0000 0000 0813 8040 063c 778f
|
|
|
|
2. Sequence in Step by Step.
|
|
a) Update RCW for slave with boot from SRIO port 1 configuration.
|
|
b) Program slave's U-Boot image, UCode, and ENV parameters into master's
|
|
NorFlash.
|
|
c) Set environment variable "bootmaster" to "SRIO1" and save environment
|
|
for master.
|
|
setenv bootmaster SRIO1
|
|
saveenv
|
|
d) Restart up master and it will boot up normally from its NorFlash.
|
|
Then, it will finish necessary configurations for slave's boot from
|
|
SRIO port 1.
|
|
e) Master will set inbound SRIO windows covered slave's U-Boot image stored
|
|
in master's NorFlash.
|
|
f) Master will set an inbound SRIO window covered slave's UCode and ENV
|
|
stored in master's NorFlash.
|
|
g) Master will set outbound SRIO windows in order to configure slave's
|
|
registers for the core's releasing.
|
|
h) Since all cores of slave in holdoff, slave should be powered on before all
|
|
the above master's steps, and wait to be released by master. In the
|
|
startup phase of the slave from SRIO, it will finish some necessary
|
|
configurations.
|
|
i) Slave will set a specific TLB entry for the boot process.
|
|
j) Slave will set a LAW entry with the TargetID SRIO port 1 for the boot.
|
|
k) Slave will set a specific TLB entry in order to fetch UCode and ENV
|
|
from master.
|
|
l) Slave will set a LAW entry with the TargetID SRIO port 1 for UCode and ENV.
|
|
|
|
How to use this feature:
|
|
To use this feature, you need to focus those points.
|
|
|
|
1. Slave's RCW with SRIO boot configurations, and all cores in holdoff
|
|
configurations.
|
|
Please refer to the examples given above.
|
|
|
|
2. U-Boot image's compilation.
|
|
For master, U-Boot image should be generated normally.
|
|
|
|
For example, master U-Boot image used on P4080DS should be compiled with
|
|
|
|
make P4080DS_config.
|
|
|
|
For slave, U-Boot image should be generated specifically by
|
|
|
|
make xxxx_SRIOBOOT_SLAVE_config.
|
|
|
|
For example, slave U-Boot image used on P4080DS should be compiled with
|
|
|
|
make P4080DS_SRIOBOOT_SLAVE_config.
|
|
|
|
3. Necessary modifications based on a specific environment.
|
|
For a specific environment, the addresses of the slave's U-Boot image,
|
|
UCode, ENV stored in master's NorFlash, and any other configurations
|
|
can be modified in the file:
|
|
include/configs/corenet_ds.h.
|
|
|
|
4. Set and save the environment variable "bootmaster" with "SRIO1" or "SRIO2"
|
|
for master, and then restart it in order to perform the role as a master
|
|
for boot from SRIO.
|