119 lines
5.3 KiB
Plaintext
119 lines
5.3 KiB
Plaintext
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SRIO and PCIE Boot on Corenet Platforms
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For some PowerPC processors with SRIO or PCIE interface, boot location can be
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configured to SRIO or PCIE by RCW. The processor booting from SRIO or PCIE can
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do without flash for u-boot image, ucode and ENV. All the images can be fetched
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from another processor's memory space by SRIO or PCIE link connected between
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them.
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This document describes the processes based on an example implemented on P4080DS
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platforms and a RCW example with boot from SRIO or PCIE configuration.
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Environment of the SRIO or PCIE boot:
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a) Master and slave can be SOCs in one board or SOCs in separate boards.
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b) They are connected with SRIO or PCIE links, whether 1x, 2x or 4x, and
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directly or through switch system.
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c) Only Master has NorFlash for booting, and all the Master's and Slave's
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U-Boot images, UCodes will be stored in this flash.
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d) Slave has its own EEPROM for RCW and PBI.
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e) Slave's RCW should configure the SerDes for SRIO or PCIE boot port, set
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the boot location to SRIO or PCIE, and holdoff all the cores.
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----------- ----------- -----------
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| | | | | |
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| NorFlash|<----->| Master |SRIO or PCIE | Slave |<---->[EEPROM]
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| | | |<===========>| |
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| | | | | |
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----------- ----------- -----------
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The example based on P4080DS platform:
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Two P4080DS platforms can be used to implement the boot from SRIO or PCIE.
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Their SRIO or PCIE ports 1 will be connected directly and will be used for
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the boot from SRIO or PCIE.
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1. Slave's RCW example for boot from SRIO port 1 and all cores in holdoff.
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00000000: aa55 aa55 010e 0100 0c58 0000 0000 0000
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00000010: 1818 1818 0000 8888 7440 4000 0000 2000
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00000020: f440 0000 0100 0000 0000 0000 0000 0000
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00000030: 0000 0000 0083 0000 0000 0000 0000 0000
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00000040: 0000 0000 0000 0000 0813 8040 063c 778f
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2. Slave's RCW example for boot from PCIE port 1 and all cores in holdoff.
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00000000: aa55 aa55 010e 0100 0c58 0000 0000 0000
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00000010: 1818 1818 0000 8888 1440 4000 0000 2000
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00000020: f040 0000 0100 0000 0020 0000 0000 0000
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00000030: 0000 0000 0083 0000 0000 0000 0000 0000
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00000040: 0000 0000 0000 0000 0813 8040 547e ffc9
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3. Sequence in Step by Step.
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a) Update RCW for slave with boot from SRIO or PCIE port 1 configuration.
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b) Program slave's U-Boot image, UCode, and ENV parameters into master's
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NorFlash.
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c) Set environment variable "bootmaster" to "SRIO1" or "PCIE1" and save
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environment for master.
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setenv bootmaster SRIO1
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or
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setenv bootmaster PCIE1
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saveenv
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d) Restart up master and it will boot up normally from its NorFlash.
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Then, it will finish necessary configurations for slave's boot from
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SRIO or PCIE port 1.
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e) Master will set inbound SRIO or PCIE windows covered slave's U-Boot
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image stored in master's NorFlash.
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f) Master will set an inbound SRIO or PCIE window covered slave's UCode
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and ENV stored in master's NorFlash.
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g) Master will set outbound SRIO or PCIE windows in order to configure
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slave's registers for the core's releasing.
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h) Since all cores of slave in holdoff, slave should be powered on before
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all the above master's steps, and wait to be released by master. In the
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startup phase of the slave from SRIO or PCIE, it will finish some
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necessary configurations.
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i) Slave will set a specific TLB entry for the boot process.
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j) Slave will set a LAW entry with the TargetID SRIO or PCIE port 1 for
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the boot.
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k) Slave will set a specific TLB entry in order to fetch UCode and ENV
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from master.
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l) Slave will set a LAW entry with the TargetID SRIO or PCIE port 1 for
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UCode and ENV.
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How to use this feature:
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To use this feature, you need to focus those points.
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1. Slave's RCW with SRIO or PCIE boot configurations, and all cores in holdoff
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configurations.
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Please refer to the examples given above.
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2. U-Boot image's compilation.
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For master, U-Boot image should be generated normally.
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For example, master U-Boot image used on P4080DS should be compiled with
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make P4080DS_config.
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For slave, U-Boot image should be generated specifically by
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make xxxx_SRIO_PCIE_BOOT_config.
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For example, slave U-Boot image used on P4080DS should be compiled with
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make P4080DS_SRIO_PCIE_BOOT_config.
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3. Necessary modifications based on a specific environment.
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For a specific environment, the addresses of the slave's U-Boot image,
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UCode, ENV stored in master's NorFlash, and any other configurations
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can be modified in the file:
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include/configs/corenet_ds.h.
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4. Set and save the environment variable "bootmaster" with "SRIO1", "SRIO2"
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or "PCIE1", "PCIE2", "PCIE3" for master, and then restart it in order to
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perform the role as a master for boot from SRIO or PCIE.
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NOTE: When the Slave's ENV parameters are stored in Master's NorFlash,
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it can fetch them through PCIE or SRIO interface. But the ENV
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parameters can not be modified by "saveenv" or other commands under
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the Slave's u-boot environment, because the Slave can not erase,
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write Master's NorFlash by PCIE or SRIO link.
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