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3.2 

System Control Processor (SCP) firmware

The System Control Processor (SCP) manages the overall power, clock, reset, and system control of the
ADP. Because of the hardware design, the SCP firmware is an inherently trusted part of the ADP
software system. All the memory that the SCP uses for execution and private storage is on-chip to
prevent attackers tampering with it.

 

Note

 

The SCP Firmware is only available as a pre-built binary.

3.2.1 

SCP ROM firmware

The SCP ROM firmware is the first code to execute on the Juno ADP after a cold reset. This code is
fixed for the lifetime of the device and therefore executes minimal code to maximize robustness and
reduce the risk of security vulnerabilities.

The SCP ROM firmware configures the initial state of the hardware platform, for example:
• Cores that are released from reset.
• Clocks that are running and their default frequencies.
• Power domains within the SoC which are powered on.

Boot protocol

The SCP ROM firmware interacts with the ARM Trusted Firmware, which securely transfers the SCP
RAM firmware image to the SCP at runtime. The SCP then passes control from the SCP ROM firmware
to the SCP RAM firmware and the boot process continues.

More information about the Boot Over MHU (BOM) protocol used for this process is available as part of
the 

ARM Compute Subsystems SCP Message Interface Protocols

 document, available from 

http://

infocenter.arm.com/help/topic/com.arm.doc.dui0922-/index.html

.

3.2.2 

SCP RAM firmware

The SCP RAM firmware is a second firmware image for the SCP which provides runtime services to the
application processors.

3.2.3 

System Control and Power Interface (SCPI)

The SCPI is the generic runtime interface to the SCP from the AP through the MHU.

It includes:
• Reporting the capabilities of the system and certain devices within it. For example, reporting the

available sensors, or the number of power domains.

• Control of power domains and voltages.
• Control of PLLs and clock frequencies.
• Control of the performance level of the processors and GPU through 

Dynamic Voltage and Frequency

Scaling 

(DVFS).

• Watchdog and timer services.
• Sensor monitoring, thermal cut-out, and fault reporting.

This interface is described in described in the 

ARM Compute Subsystems SCP Message Interface

Protocols

 document, available from 

http://infocenter.arm.com/help/topic/com.arm.doc.dui0922-/

index.html

.

3 Firmware

3.2 System Control Processor (SCP) firmware

ARM DEN0928F

Copyright © 2015 ARM. All rights reserved.

3-27

Non-Confidential

Содержание Juno ARM

Страница 1: ...Juno ARM Development Platform Version 2 0 Getting Started Guide Copyright 2015 ARM All rights reserved ARM DEN0928F ...

Страница 2: ...ical errors TO THE EXTENT NOT PROHIBITED BY LAW IN NO EVENT WILL ARM BE LIABLE FOR ANY DAMAGES INCLUDING WITHOUT LIMITATION ANY DIRECT INDIRECT SPECIAL INCIDENTAL PUNITIVE OR CONSEQUENTIAL DAMAGES HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY ARISING OUT OF ANY USE OF THIS DOCUMENT EVEN IF ARM HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES This document consists solely of commercia...

Страница 3: ...n when handling Versatile Express boards The motherboard generates uses and can radiate radio frequency energy and may cause harmful interference to radio communications There is no guarantee that interference will not occur in a particular installation If this equipment causes harmful interference to radio or television reception which can be determined by turning the equipment off or on you are ...

Страница 4: ...ration 1 14 1 5 Monitor compatibility 1 15 Chapter 2 Configuration 2 1 Connecting to a host computer 2 17 2 2 SD card filesystem layout 2 18 2 3 Flash memory programming 2 19 2 4 Erasing the flash memory 2 21 2 5 Board recovery procedure 2 22 2 6 Juno SoC configuration 2 23 2 7 Linux filesystems 2 24 Chapter 3 Firmware 3 1 Firmware components 3 26 ARM DEN0928F Copyright 2015 ARM All rights reserve...

Страница 5: ...2 System Control Processor SCP firmware 3 27 3 3 Application Processor AP firmware 3 28 Appendix A Revisions A 1 Revisions Appx A 30 ARM DEN0928F Copyright 2015 ARM All rights reserved 5 Non Confidential ...

Страница 6: ...reface introduces the Juno ARM Development Platform Getting Started Guide It contains the following About this book on page 7 Feedback on page 9 ARM DEN0928F Copyright 2015 ARM All rights reserved 6 Non Confidential ...

Страница 7: ...ecial terminology denotes cross references and citations bold Highlights interface elements such as menu names Denotes signal names Also used for terms in descriptive lists where appropriate monospace Denotes text that you can enter at the keyboard such as commands file and program names and source code monospace Denotes a permitted abbreviation for a command or option You can enter the underlined...

Страница 8: ...ems ARM DEN 0022 Trusted Board Boot Requirements CLIENT TTBR CLIENT System Software on ARM ARM DEN 0006C 1 ARM Compute Subsystem SCP Message Interface Protocols ARM DUI 0922 ARM Versatile Express Juno r2 Development Platform V2M Juno r2 Technical Reference Manual 100114 ARM Versatile Express Juno r1 Development Platform V2M Juno r1 Technical Reference Manual 100122 ARM Versatile Express Juno Devel...

Страница 9: ...hen send an e mail to errata arm com Give The title Juno ARM Development Platform Getting Started Guide The number ARM DEN0928F If applicable the page number s to which your comments refer A concise explanation of your comments ARM also welcomes general suggestions for additions and improvements Note ARM tests the PDF only in Adobe Acrobat and Acrobat Reader and cannot guarantee the quality of the...

Страница 10: ...t contains the following sections 1 1 About the Juno ADP on page 1 11 1 2 Ports and I O on page 1 12 1 3 Use of Ethernet ports on page 1 13 1 4 UART configuration on page 1 14 1 5 Monitor compatibility on page 1 15 ARM DEN0928F Copyright 2015 ARM All rights reserved 1 10 Non Confidential ...

Страница 11: ...e to hardware limitations Note The big LITTLE MP scheduler is not optimized The following hardware features are available only on Juno r1 and later Peripheral Component Interconnect Express PCIe Gen 2 0 support Reference firmware and other software images are available for the Juno ADP from Linaro Note The use of Juno software is subject to the terms of the Juno End User License Agreement External...

Страница 12: ...internally over a Static Memory Bus SMB The USB ports exist only on Juno r0 The following figure shows the rear panel of the V2M Juno motherboard Figure 1 2 V2M Juno motherboard rear panel The rear Ethernet port is not enabled in hardware on Juno r0 On Juno r1 and later it is enabled and connected over the PCI Express bus 1 Introduction 1 2 Ports and I O ARM DEN0928F Copyright 2015 ARM All rights ...

Страница 13: ...front Ethernet port is numbered eth0 The rear port is not enabled in hardware and therefore the kernel does not allocate a number Juno r1 and later Using the Linaro tracking kernel with the OpenEmbedded filesystem results in the rear Ethernet port being numbered eth0 This kernel and filesystem combination does not support the front Ethernet port without extra configuration The Linaro Stable Kernel...

Страница 14: ...irmware or UEFI FGPA UART0 Corresponds to the J55 header on the V2M Juno motherboard Contact ARM for further information about this type of header Used by the ARM Trusted Firmware FGPA UART1 Corresponds to the J56 header on the V2M Juno motherboard Contact ARM for further information about this type of header Used by the SCP Firmware if it is built in debug mode 1 4 1 Settings For all UARTs the se...

Страница 15: ...0 1080 60Hz 91 Yesa 0 n a 9 BenQ GL2450 1920 1080 60Hz 100 Yesa n a n a n a BenQ G2200WT 1680 1050 60Hz 100 No n a n a n a BenQ BL2201 1680 1050 60Hz 100 No n a n a n a Dell P1911 1440 900 60Hz 100 No n a n a n a HP L1940T 1280 1024 60Hz 100 No n a n a n a Iiyama ProLite E511S 1600 1200 60Hz 100 No n a n a n a LG LED 22M35 1920 1080 60Hz 100 Yesa n a n a n a NEC EA274WMi 2560 1440 52 1Hz 100 Yesa ...

Страница 16: ... a host computer on page 2 17 2 2 SD card filesystem layout on page 2 18 2 3 Flash memory programming on page 2 19 2 4 Erasing the flash memory on page 2 21 2 5 Board recovery procedure on page 2 22 2 6 Juno SoC configuration on page 2 23 2 7 Linux filesystems on page 2 24 ARM DEN0928F Copyright 2015 ARM All rights reserved 2 16 Non Confidential ...

Страница 17: ...el 2 Connect a USB cable between the USB B connector on the rear panel and a USB port of your host computer 3 Connect the 12 volt power supply to the V2M Juno motherboard The serial terminal shows the command prompt Cmd Note If the command prompt is not shown ensure that both configuration switches are in the top position Also reset the V2M Juno motherboard using the hardware reset button The hard...

Страница 18: ...ss storage device with a FAT16 filesystem A brief description of the filesystem layout follows SITE1 Motherboard firmware BIOS IOFPGA image PMIC configuration SITE2 Supporting files for LogicTile daughterboards HBI0262B Configuration files for Juno r0 only HBI0262C Configuration files for Juno r1 only SOFTWARE SoC software images SCP Firmware ARM Trusted Firmware UEFI Linux etc config txt Configur...

Страница 19: ...R0FILE SOFTWARE fip bin Image File Name NOR0LOAD 00000000 Image Load Address NOR0ENTRY 00000000 Image Entry Point NOR1UPDATE AUTO Image Update NONE AUTO FORCE NOR1ADDRESS 0x03EC0000 Image Flash Address NOR1FILE SOFTWARE bl1 bin Image File Name NOR1LOAD 00000000 Image Load Address NOR1ENTRY 00000000 Image Entry Point The TOTALIMAGES value informs the V2M Juno motherboard firmware of the number of i...

Страница 20: ...ograms the flash memory with the contents of the file on the SD card at every boot regardless of whether it has changed or not ADDRESS The base address within the flash memory that the image is programmed to The address must always be prefixed with 0x NAME The path to and name of the file that is programmed All paths must be specified from the root of the SD card filesystem LOAD Leave as zero unle...

Страница 21: ...nitializes 3 At the Flash prompt enter eraseall 4 Once the V2M Juno motherboard firmware has finished erasing the flash memory at the Flash prompt enter exit 5 The V2M Juno motherboard powers down and returns to the Cmd prompt On the subsequent boot the V2M Juno motherboard firmware copies images from the SD card into the flash memory following the definitions in the images txt file You should see...

Страница 22: ...tforms There are multiple firmware bundles available each of which provides a different software environment for example Android OpenEmbedded or Busybox Extract the required bundle directly onto the SD card ensuring that the directory structure of its archive is preserved 6 If the host computer operating system is Linux ARM recommends that you use the sync command to ensure that any pending write ...

Страница 23: ...lity to boot the SCP Firmware and ARM Trusted Firmware successfully Example 2 2 board txt file BOARD HBI0262 TITLE V2M Juno DevChip Configuration File SCC REGISTERS TOTALSCCS 9 SCC 0x10C 0x00019300 A53 PLL Register 1 SCC 0x0F8 0x0BEC0000 BL1 entry point SCC 0xA14 0x00000000 PCLKDBG_CONTROL DIV 1 SCC 0x118 0x003F1000 SYS PLL Register 0 1600MHz SCC 0x11C 0x0001F100 SYS PLL Register 1 SCC 0x100 0x003...

Страница 24: ... a filesystem to be attached Note If you are using a pre built Busybox image the system will boot Linux fully without the need for an external USB storage device containing a filesystem ARM recommends that a USB disk is connected using one of the four USB 2 0 ports on the rear panel The type of USB disk can be a flash drive or a hard drive as both are compatible See http community arm com groups a...

Страница 25: ...no ADP supports It contains the following sections 3 1 Firmware components on page 3 26 3 2 System Control Processor SCP firmware on page 3 27 3 3 Application Processor AP firmware on page 3 28 ARM DEN0928F Copyright 2015 ARM All rights reserved 3 25 Non Confidential ...

Страница 26: ...ystem SCP Message Interface Protocols document available at http infocenter arm com help topic com arm doc dui0922 index html ARM Trusted Firmware ARM Trusted Firmware provides a reference implementation of Secure world software for ARMv8 A including Exception level 3 EL3 software Unified Extensible Firmware Interface UEFI The Juno ADP implementation of UEFI provides operating system loader suppor...

Страница 27: ... to the SCP RAM firmware and the boot process continues More information about the Boot Over MHU BOM protocol used for this process is available as part of the ARM Compute Subsystems SCP Message Interface Protocols document available from http infocenter arm com help topic com arm doc dui0922 index html 3 2 2 SCP RAM firmware The SCP RAM firmware is a second firmware image for the SCP which provid...

Страница 28: ...ase code syncing instructions at http community arm com groups arm development platforms The ARM Trusted Firmware code is designed for reuse or porting to other ARMv8 A model and hardware platforms 3 3 2 Unified extensible Interface Firmware UEFI The Unified Extensible Firmware Interface UEFI is a boot firmware specification that the UEFI forum maintains and develops ARM is a member of the UEFI fo...

Страница 29: ...s appendix describes the technical changes between released issues of this book It contains the following sections A 1 Revisions on page Appx A 30 ARM DEN0928F Copyright 2015 ARM All rights reserved Appx A 29 Non Confidential ...

Страница 30: ... the original footnote a 1 5 Monitor compatibility on page 1 15 Issue D Updated 3 18 kernel command line argument replacing DVI D with HDMI A 1 5 Monitor compatibility on page 1 15 Issue D Deleted footnote reference for BenQ GL2450 in the Success rate column 1 5 Monitor compatibility on page 1 15 Issue D Table A 5 Table A 5 Differences between Issue D and Issue E Change Location Affects No changes...

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