--- /dev/null
+---------------------------------------
+SRIO and PCIE Boot on Corenet Platforms
+---------------------------------------
+
+For some PowerPC processors with SRIO or PCIE interface, boot location can be
+configured to SRIO or PCIE by RCW. The processor booting from SRIO or PCIE 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 or PCIE 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 or PCIE configuration.
+
+Environment of the SRIO or PCIE boot:
+ a) Master and slave can be SOCs in one board or SOCs in separate boards.
+ b) They are connected with SRIO or PCIE links, whether 1x, 2x 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 or PCIE boot port, set
+ the boot location to SRIO or PCIE, and holdoff all the cores.
+
+ ----------- ----------- -----------
+ | | | | | |
+ | | | | | |
+ | NorFlash|<----->| Master |SRIO or PCIE | Slave |<---->[EEPROM]
+ | | | |<===========>| |
+ | | | | | |
+ ----------- ----------- -----------
+
+The example based on P4080DS platform:
+ Two P4080DS platforms can be used to implement the boot from SRIO or PCIE.
+ Their SRIO or PCIE ports 1 will be connected directly and will be used for
+ the boot from SRIO or PCIE.
+
+ 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. Slave's RCW example for boot from PCIE port 1 and all cores in holdoff.
+ 00000000: aa55 aa55 010e 0100 0c58 0000 0000 0000
+ 00000010: 1818 1818 0000 8888 1440 4000 0000 2000
+ 00000020: f040 0000 0100 0000 0020 0000 0000 0000
+ 00000030: 0000 0000 0083 0000 0000 0000 0000 0000
+ 00000040: 0000 0000 0000 0000 0813 8040 547e ffc9
+
+ 3. Sequence in Step by Step.
+ a) Update RCW for slave with boot from SRIO or PCIE 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" or "PCIE1" and save
+ environment for master.
+ setenv bootmaster SRIO1
+ or
+ setenv bootmaster PCIE1
+ 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 or PCIE port 1.
+ e) Master will set inbound SRIO or PCIE windows covered slave's U-Boot
+ image stored in master's NorFlash.
+ f) Master will set an inbound SRIO or PCIE window covered slave's UCode
+ and ENV stored in master's NorFlash.
+ g) Master will set outbound SRIO or PCIE 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 or PCIE, 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 or PCIE 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 or PCIE 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 or PCIE 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_SRIO_PCIE_BOOT_config.
+
+ For example, slave U-Boot image used on P4080DS should be compiled with
+
+ make P4080DS_SRIO_PCIE_BOOT_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", "SRIO2"
+ or "PCIE1", "PCIE2", "PCIE3" for master, and then restart it in order to
+ perform the role as a master for boot from SRIO or PCIE.
+
+NOTE: When the Slave's ENV parameters are stored in Master's NorFlash,
+ it can fetch them through PCIE or SRIO interface. But the ENV
+ parameters can not be modified by "saveenv" or other commands under
+ the Slave's u-boot environment, because the Slave can not erase,
+ write Master's NorFlash by PCIE or SRIO link.
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