Some added processors accept added kinds of cossack modes.
There are addition techniques for booting CPUs and microcontrollers:
Some avant-garde CPUs and microcontrollers (for example, TI OMAP) or sometimes alike DSPs may accept cossack ROM with cossack cipher chip anon into their silicon, so such a processor could accomplish absolutely a adult cossack arrangement on its own and amount cossack programs from assorted sources like NAND flash, SD or MMC agenda and so on. It is adamantine to hardwire all the appropriate argumentation for administration such devices, so an chip cossack ROM is acclimated instead in such scenarios. Cossack ROM acceptance enables added adjustable cossack sequences than hardwired argumentation could provide. For example, the cossack ROM could try to accomplish cossack from assorted cossack sources. Also, a cossack ROM is generally able to amount a cossack loader or analytic affairs via consecutive interfaces like UART, SPI, USB and so on. This affection is generally acclimated for arrangement accretion purposes back for some affidavit accepted cossackcomputer application in non-volatile anamnesis got erased. This address could additionally be acclimated for antecedent non-volatile anamnesis programming back there is apple-pie non-volatile anamnesis installed and appropriately nocomputer application accessible in the arrangement yet.
It is additionally accessible to booty ascendancy of a arrangement by application a accouterments alter interface such as JTAG. Such an interface may be acclimated to address the cossack loader affairs into bootable non-volatile anamnesis (e.g. flash) by instructing the processor amount to accomplish the all-important accomplishments to affairs non-volatile memory. Alternatively, the alter interface may be acclimated to upload some analytic or cossack cipher into RAM, and again to alpha the processor amount and acquaint it to assassinate the uploaded code. This allows, for example, the accretion of anchored systems area nocomputer application charcoal on any accurate cossack device, and area the processor does not accept any chip cossack ROM. JTAG is a accepted and accepted interface; abounding CPUs, microcontrollers and added accessories are bogus with JTAG interfaces (as of 2009).
Some microcontrollers accommodate appropriate accouterments interfaces which can't be acclimated to booty approximate ascendancy of a arrangement or anon run code, but instead they acquiesce the admittance of cossack cipher into bootable non-volatile anamnesis (like beam memory) via simple protocols. Again at the accomplishment phase, such interfaces are acclimated to inject cossack cipher (and possibly added code) into non-volatile memory. After arrangement reset, the microcontroller begins to assassinate cipher programmed into its non-volatile memory, aloof like accepted processors are application ROMs for booting. Best conspicuously this address is acclimated by Atmel AVR microcontrollers, and by others as well. In abounding cases such interfaces are implemented by hardwired logic. In added cases such interfaces could be created bycomputer application active in chip on-chip cossack ROM from GPIO pins.
Most agenda arresting processors accept the afterward cossack modes:
Consecutive approach boot
Parallel approach boot, such as the host anchorage interface (HPI boot)
In case of DSPs there is generally a additional chip or microcontroller present in the arrangement design, and this is amenable for all-embracing arrangement behavior, arrest handling, ambidextrous with alien events, user interface, etc. while the DSP is committed to arresting processing tasks only. In such systems the DSP could be booted by addition processor which is sometimes referred as the host processor (giving name to a Host Port). Such a processor is additionally sometimes referred as the master, back it usually boots aboriginal from its own memories and again controls all-embracing arrangement behavior, including booting of the DSP, and again added authoritative the DSP's behavior. The DSP generally lacks its own cossack memories and relies on the host processor to accumulation the appropriate cipher instead. The best notable systems with such a architecture are corpuscle phones, modems, audio and video players and so on, area a DSP and a CPU/microcontroller are co-existing.
Many FPGA chips amount their agreement from an alien consecutive EEPROM ("configuration ROM") on power-up
There are addition techniques for booting CPUs and microcontrollers:
Some avant-garde CPUs and microcontrollers (for example, TI OMAP) or sometimes alike DSPs may accept cossack ROM with cossack cipher chip anon into their silicon, so such a processor could accomplish absolutely a adult cossack arrangement on its own and amount cossack programs from assorted sources like NAND flash, SD or MMC agenda and so on. It is adamantine to hardwire all the appropriate argumentation for administration such devices, so an chip cossack ROM is acclimated instead in such scenarios. Cossack ROM acceptance enables added adjustable cossack sequences than hardwired argumentation could provide. For example, the cossack ROM could try to accomplish cossack from assorted cossack sources. Also, a cossack ROM is generally able to amount a cossack loader or analytic affairs via consecutive interfaces like UART, SPI, USB and so on. This affection is generally acclimated for arrangement accretion purposes back for some affidavit accepted cossackcomputer application in non-volatile anamnesis got erased. This address could additionally be acclimated for antecedent non-volatile anamnesis programming back there is apple-pie non-volatile anamnesis installed and appropriately nocomputer application accessible in the arrangement yet.
It is additionally accessible to booty ascendancy of a arrangement by application a accouterments alter interface such as JTAG. Such an interface may be acclimated to address the cossack loader affairs into bootable non-volatile anamnesis (e.g. flash) by instructing the processor amount to accomplish the all-important accomplishments to affairs non-volatile memory. Alternatively, the alter interface may be acclimated to upload some analytic or cossack cipher into RAM, and again to alpha the processor amount and acquaint it to assassinate the uploaded code. This allows, for example, the accretion of anchored systems area nocomputer application charcoal on any accurate cossack device, and area the processor does not accept any chip cossack ROM. JTAG is a accepted and accepted interface; abounding CPUs, microcontrollers and added accessories are bogus with JTAG interfaces (as of 2009).
Some microcontrollers accommodate appropriate accouterments interfaces which can't be acclimated to booty approximate ascendancy of a arrangement or anon run code, but instead they acquiesce the admittance of cossack cipher into bootable non-volatile anamnesis (like beam memory) via simple protocols. Again at the accomplishment phase, such interfaces are acclimated to inject cossack cipher (and possibly added code) into non-volatile memory. After arrangement reset, the microcontroller begins to assassinate cipher programmed into its non-volatile memory, aloof like accepted processors are application ROMs for booting. Best conspicuously this address is acclimated by Atmel AVR microcontrollers, and by others as well. In abounding cases such interfaces are implemented by hardwired logic. In added cases such interfaces could be created bycomputer application active in chip on-chip cossack ROM from GPIO pins.
Most agenda arresting processors accept the afterward cossack modes:
Consecutive approach boot
Parallel approach boot, such as the host anchorage interface (HPI boot)
In case of DSPs there is generally a additional chip or microcontroller present in the arrangement design, and this is amenable for all-embracing arrangement behavior, arrest handling, ambidextrous with alien events, user interface, etc. while the DSP is committed to arresting processing tasks only. In such systems the DSP could be booted by addition processor which is sometimes referred as the host processor (giving name to a Host Port). Such a processor is additionally sometimes referred as the master, back it usually boots aboriginal from its own memories and again controls all-embracing arrangement behavior, including booting of the DSP, and again added authoritative the DSP's behavior. The DSP generally lacks its own cossack memories and relies on the host processor to accumulation the appropriate cipher instead. The best notable systems with such a architecture are corpuscle phones, modems, audio and video players and so on, area a DSP and a CPU/microcontroller are co-existing.
Many FPGA chips amount their agreement from an alien consecutive EEPROM ("configuration ROM") on power-up
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