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diff --git a/doc/README.srio-pcie-boot-corenet b/doc/README.srio-pcie-boot-corenet new file mode 100644 index 0000000..cd7e7ee --- /dev/null +++ b/doc/README.srio-pcie-boot-corenet @@ -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. |