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Hello,
I have a question regarding the behavior of a device if it is turned
off and then is plugged into power. I want the device to turn on after
power plugged in.
But I really don't know where to start. I even can't figure out what
part of the system (hardware/software) would be responsible for this
kind of actions. There must be some event since some devices show
'charging animations'.
The device I am currently working with is a rooted Galaxy Nexus.
Even if you are not sure, currently every guess would help me to
investigate further!
Thanks,
Mark
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Hi Olivier,
Thanks for the clarifications. Q1 and Q2 are not yet clear to me. Please
find my response embedded in mail below.
Best Regards,
Asha
On Tue, Mar 27, 2012 at 12:15 AM, Olivier Martin <olivier.martin(a)arm.com>wrote:
> Hi Asha,****
>
> ** **
>
> *Q1: Is UEFI flashed as single binary i.e., PlatformPkg.fd or different
> efi's?*
>
> It really depends of your configuration/platform. UEFI is only a portion
> of your boot firmware. Prior to UEFI, you might have one (or more)
> additional boot code/firmware.****
>
> The EDK2 FDF file will help you to generate a Firmware Device file you can
> flash onto your platform Non-Volatile memory (eg: ROM, NAND)****
>
> But you can also load single EFI application/driver (EFI binary) from a
> UEFI firmware. For instance, if you develop a EFI driver, you do not need
> to rebuild the full Platform UEFI firmware. You can load the single EFI
> driver.****
>
> ** [Asha]
>
Assuming UEFI binary is flashed to NAND Flash, the Firmware (some
bootloader) prior to UEFI will load UEFI
binary (xxx.fd) from volatile memory like ROM, NAND to RAM. In this
scenario, will the binary xxx.fd be copied to
RAM or just the SEC phase of UEFI?
> **
>
> *Q2. As the code is in ROM (flash), I understand that it must be copied
> to RAM for execution.
> **
>
> Will complete UEFI be copied to RAM or some phase or section wise?
> *
>
> RAM provides much better performance than some other memory storage. Code
> can also be run from RAM (at the difference of NAND for instance).****
>
> But there is no requirement to copy the code into RAM for execution. It
> depends of your platform specification and the choice of the firmware
> engineer.****
>
> If we take the example of EDK2 code base, the PEI Core (Pre EFI phase)
> copies the firmware into DRAM as soon as the System Memory (DRAM) is setup.
> ****
>
> ** [Asha]
>
Considering EDK2 as example, if PEI core must initialize DRAM, from
where will PEI core be executed? From
flash? you said "PEI Core (Pre EFI phase) copies the firmware into
DRAM "
what or which "firmware" is this? Is it DXE?
> **
>
> *Q3. How does operating system invoke the UEFI Runtime services? *
>
> The UEFI specification covers this part . See the section “2.3 Calling
> Convention“ of the Specification.****
>
> ** **
>
> *Q4. I read in one of the internet link that other than Timer, there are
> no hardware interrupts.
> Without hardware interrupt how will the USB kind of device be
> recognized? *
>
> The UEFI drivers can register functions to be called periodically (see the
> ‘Boot Services’ Event functions). The USB drivers register periodic
> functions that scan if new devices are connected.****
>
> ** **
>
> I hope that will help you,****
>
> Olivier****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* boot-architecture-bounces(a)lists.linaro.org [mailto:
> boot-architecture-bounces(a)lists.linaro.org] *On Behalf Of *Ryan Harkin
> *Sent:* 26 March 2012 16:17
> *To:* Asha R
> *Cc:* boot-architecture(a)lists.linaro.org
> *Subject:* Re: UEFI basic questions****
>
> ** **
>
> Hi Asha,
>
> I don't know the proper answers to all of your questions. I would suggest
> that the EDK2 mailing list might give you more detailed answers:
> ****
>
> edk2-devel(a)lists.sourceforge.net
>
> I think you have to sign up for the list first:
>
> https://lists.sourceforge.net/lists/listinfo/edk2-devel
>
> ****
>
> 2012/3/26 Asha R <rd.asha22(a)gmail.com>****
>
> I am new to UEFI and trying to understand working of UEFI on ARM platform.
> ****
>
> On building UEFI, there are different binaries generated for each phase
> and also for drivers
> eg: platformSec.efi, platformBds.efi and UsbDxe.efi,etc****
>
> Q1. Is UEFI flashed as single binary i.e., PlatformPkg.fd or different
> efi's? ****
>
> I flash a single .fd onto my platforms.****
>
> Q1. As the code is in ROM (flash), I understand that it must be copied to
> RAM for execution.
> Will complete UEFI be copied to RAM or some phase or section wise? *
> ***
>
> Q3. How does operating sysetm invoke the UEFI Runtime services? ****
>
> Q4. I read in one of the internet link that other than Timer, there are no
> hardware interrupts.
> Without hardware interrupt how will the USB kind of device be
> recognized? ****
>
> UEFI has interrupt support for ARM platforms.****
>
>
> Regards,
> Ryan.****
>
I am new to UEFI and trying to understand working of UEFI on ARM platform.
On building UEFI, there are different binaries generated for each phase and
also for drivers
eg: platformSec.efi, platformBds.efi and UsbDxe.efi,etc
Q1. Is UEFI flashed as single binary i.e., PlatformPkg.fd or different
efi's?
Q1. As the code is in ROM (flash), I understand that it must be copied to
RAM for execution.
Will complete UEFI be copied to RAM or some phase or section wise?
Q3. How does operating sysetm invoke the UEFI Runtime services?
Q4. I read in one of the internet link that other than Timer, there are no
hardware interrupts.
Without hardware interrupt how will the USB kind of device be
recognized?
Kindly clarify my doubts to help me in understanding UEFI better. Thanks in
advance.
Regards,
Asha R
