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Merge pull request #374 from andrum99/patch-1

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imager/README.txt: typo, grammar, style fixes
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Tim Gover
2021-10-11 08:57:55 +01:00
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parent a63b3c7ff4 0cddcd363f
commit e76eaf795e
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imager/README.txt
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Raspberry Pi 4 EEPROM bootloader rescue image
*********************************************
The Raspberry Pi 4 has a small EEPROM used to store the bootloader.
The Raspberry Pi 4 contains a small EEPROM used to store the bootloader.
This rescue image reverts the bootloader EEPROM to factory default settings.
This rescue image also updates the USB 3.0 (VL805) firmware to the latest
version (138a1) with better full-speed Isochronous endpoint support.
This rescue image also updates the USB 3 controller (VL805) firmware to the
latest version, 138a1, which has better full-speed isochronous endpoint
support.
This easiest method for creating EEPROM rescue images or formatting sdcards
is to use the Raspberry Pi Imager from https://raspberrypi.com/software.
The imager provides a GUI for downloading the latest version of this rescue
image and flashing it to a spare SD CARD.
Raspberry Pi 4 board revisions 1.1 and 1.2 contain a separate EEPROM
which contains firmware for the USB 3 controller (VL805): on newer revisions
the USB controller firmware is stored in the bootloader EEPROM along with
the bootloader.
The easiest method for creating EEPROM rescue images, and formatting SD
cards, is to use Raspberry Pi Imager from https://raspberrypi.com/software.
Raspberry Pi Imager provides a GUI for downloading the latest version of
this rescue image and flashing it to a spare SD card.
Alternatively, copy the contents of this zip file to a blank
FAT formatted SD-CARD. The FAT partition must be < 32 GB.
FAT formatted SD card. The FAT partition must be < 32 GB.
To update the EEPROMs:
To update the EEPROM:
1. Power off the Raspberry Pi
2. Insert the SD-CARD
3. Power on Raspberry Pi
2. Insert the bootloader update SD card
3. Power on the Raspberry Pi
4. Wait at least 10 seconds
If successful, the green LED light will blink rapidly (forever), otherwise
an error pattern will be displayed.
If successful, the green LED on the Raspberry Pi will blink rapidly forever.
An unsuccessful update of the EEPROM is indicated by a different blinking
pattern corresponding to the specific error.
If a HDMI display is attached then the screen will display green for success
or red if a failure occurs.
If an HDMI display is attached, then the screen will display green for
success or red if a failure occurs.
The SD-CARD can now be removed and re-formatted using the Raspberry Pi Imager
e.g. to install Raspberry Pi OS.
Once the EEPROM is updated, the SD card can be removed. In order to make
the entire capacity of the SD card available again, you must then reformat
the SD card using Raspberry Pi Imager by selecting the 'format card as
FAT32' option.