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The Primary Bootloader (PBL), which is stored in the Boot ROM [3] is the first stage of the boot process. This code is written by the chipset manufacturer. [4] The PBL verifies the authenticity of the next stage. On Samsung smartphones, the Samsung Secure Boot Key (SSBK) is used by the boot ROM to verify the next stages. [5]
Unlocking the bootloader allows installing and running unsigned code on a device, including user customized software. Operating outside the manufacturer specification might usually result in voiding any warranties and may make the device susceptible to data theft, as the integrity of the operating system (as intended by the manufacturer) can no longer be guaranteed. [1]
The boot ROM of NXP systems on a chip (SOCs) support configuring the peripherals through specific pins of the system on a chip. On the i.MX6 family it also supports configuring the boot order through efuses. The boot ROM of several NXP SoCs have many ways to load the first stage bootloader (from eMMC, microSD, USB, etc.).
flashing lock/oem lock *** – locks an OEM unlocked bootloader. erase – erases a specific partition. reboot – reboots the device into either the main operating system, the system recovery partition or back into its boot loader. devices – displays a list of all devices (with the serial number) connected to the host computer.
OSL2000 Boot Manager 12 February 2017: Proprietary: PLoP Boot Manager 15 April 2013: Proprietary: No cost: Official website: quibble maharmstone 20210111 February 13, 2020: 29 March 2023: GPL-3.0-or-later: No cost: Official website: RedBoot: GPL-2.0-or-later (eCos license) rEFInd (fork of rEFIt) Roderick W. Smith 0.14.4.2 March 14, 2012: 6 ...
A bootable device can be storage devices like floppy disk, CD-ROM, USB flash drive, a partition on a hard disk (where a hard disk stores multiple OS, e.g Windows and Fedora), a storage device on local network, etc. [7] A hard disk to boot Linux stores the Master Boot Record (MBR), which contains the first-stage/primary bootloader in order to be ...
Screenshot of Device Manager, containing a Qualcomm device booted in the Emergency Download Mode. The Qualcomm Emergency Download mode, commonly known as Qualcomm EDL mode and officially known as Qualcomm HS-USB QD-Loader 9008 [1] is a feature implemented in the boot ROM of a system on a chip by Qualcomm which can be used to recover bricked smartphones.
As a result of the option ROM scanning protocol, the highest-addressed option ROM is the last one to be initialized and so the last one to hook any interrupts and the first one in those interrupt service routine (ISR) chains; thus the addresses of the option ROMs completely determine the boot priority between adapter cards that are enabled for ...