|
@@ -0,0 +1,112 @@
|
|
|
+---------------------------------------
|
|
|
+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.
|