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+------------------------------
+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 if needed.
+
+ ---------- ----------- -----------
+ | | | | | |
+ | | | | | |
+ | 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 0 will be connected directly and will be used for the boot from SRIO.
+
+ 1. Slave's RCW example for boot from SRIO port 0 and core 0 not in holdoff.
+ 00000000: aa55 aa55 010e 0100 0c58 0000 0000 0000
+ 00000010: 1818 1818 0000 8888 7440 4000 0000 2000
+ 00000020: f400 0000 0100 0000 0000 0000 0000 0000
+ 00000030: 0000 0000 0083 0000 0000 0000 0000 0000
+ 00000040: 0000 0000 0000 0000 0813 8040 698b 93fe
+
+ 2. Slave's RCW example for boot from SRIO port 0 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
+
+ 3. Sequence in Step by Step.
+ a) Update RCW for slave with boot from SRIO port 0 configuration.
+ b) Program slave's U-Boot image, UCode, and ENV parameters into master's
+ NorFlash.
+ c) Start up master and it will boot up normally from its NorFlash.
+ Then, it will finish necessary configurations for slave's boot from
+ SRIO port 0.
+ d) Master will set inbound SRIO windows covered slave's U-Boot image stored
+ in master's NorFlash.
+ e) Master will set an inbound SRIO window covered slave's UCode stored in
+ master's NorFlash.
+ f) Master will set an inbound SRIO window covered slave's ENV stored in
+ master's NorFlash.
+ g) If need to release slave's core, master will set outbound SRIO windows
+ in order to configure slave's registers for the core's releasing.
+ h) If 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. If not all
+ cores in holdoff, that means core 0 will start up normally, slave should
+ be powered on after all the above master's steps. 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 0 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 0 for UCode and ENV.
+
+How to use this feature:
+ To use this feature, you need to focus three points.
+
+ 1. Slave's RCW with SRIO boot configurations, and all cores in holdoff
+ configurations if needed.
+ Please refer to the examples given above.
+
+ 2. U-Boot image's compilation.
+ For master, U-Boot image should be generated specifically by
+
+ make xxxx_SRIOBOOT_MASTER_config.
+
+ For example, master U-Boot image used on P4080DS should be compiled with
+
+ make P4080DS_SRIOBOOT_MASTER_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 SRIO port for boot, 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.