Property:PreEVA

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Term

Term:	PreEVA	Wiki	Freetz	IPPF	whmf	AVM	Web
Short for:	Pre-EVA Bootloader
Location:	Lexicon >> FRITZ-Terms
Weblinks:
Description:	Stage-1 Bootloader on MIPS equipped Multi-EVA models

Goto:   FRITZ!OS   -   Seale  -  Falcon  -  SMW-Browser

Details

PreEVA is the term used here for the Stage-1 Bootloader on MIPS equipped Multi-EVA models, until a better term is found.
It is executed when the MIPS leaves the Reset state, ie. on Powerup, and starts one of the Stage-2 EVA instances.

On Single-EVA MIPS based models EVA is started directly after Reset.

On Multi-EVA MIPS based models EVA is splitted into approx. 20% Stage-1 PreEVA and the remaining 80% Stage-2 EVA.
This is evaluated from the bytes effectively used in flash, excluding longer 0xFF blocks, regardless of partition sizes.

Stage-1 performs early low-level hardware detection and initialisation. and validates the integrity of the Stage-2 partitions.
It then boots the first valid Stage-2 bootloader, if none was found it gives up.

FRITZ!OS

There are 2 MIPS based Multi-EVA architectures, the Seale GRX500 and the Falcon PRX300 series of SoCs:

Seale

The first Multi-EVA model by AVM is the Seale based 7590ac. It has a 1 MB mtd2 partition with this internal partition layout:

• 0x000000 - 0x040000   -   PreEVA #0 - First stage EVA (256k)
• 0x040000 - 0x080000   -   PreEVA #1 - First stage EVA (256k)
• 0x080000 - 0x0C0000   -   EVA #0 - Second stage EVA (256k)
• 0x0C0000 - 0x100000   -   EVA #1 - Second stage EVA (256k)

The contents of the #0 and #1 instances of both bootloader stages are identical each.

A Firmware-Image may provide the approx. 1 MB sized urladerupdate command, containing the blobs to update mtd2.
This command merges device specific config on mtd2, like MAC addresses, with the blobs it containins before updating mtd2.

Falcon

todo

Multi-EVA boot on MIPS: (Seale, Falcon)

• Lexicon: Bootcore, Interaptive, PreEVA, EVA
• Commands: urladerupdate
• Kconfig: CONFIG_BOOTCORE_LOAD_ADDR
• Kconfig: CONFIG_SOC_PRX300_BOOTCORE, CONFIG_PRX300_BOOTCORE_WDT‎
• Kconfig: CONFIG_SOC_GRX500_BOOTCORE, CONFIG_SERIAL_GRX500_BOOTCORE_CONSOLE
• Kernel: cpunet.ko, grx_switch_console.ko
• Sysfs: switch_console

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Property:PreEVA

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