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2024-10-10: 2711: Use soft-reset to preseve SDRAM contents after ramoops (latest)

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SD card high-speed/low-voltage mode can only be exited by powercycling.
Pi 4s before rev 1.4 lack the power switch required to do this, so
must resort to a global reset that turns off many things, including
SDRAM.

To ensure correct operation, the bootloader checks that the SD I/O
voltage is the expected 3.3V, forcing a power cycle if it isn't.
However, this doesn't take advantage of presence of the dedicated
SD power switch, always forcing a global reset, a consequence of which
can be the loss of SDRAM content - including any ramoops dump of the
crash logs.

Make the bootloader more SD_PWR_ON aware, only triggering a global
reset if one isn't found.

See: https://github.com/raspberrypi/linux/issues/5298
This commit is contained in:
Tim Gover
2024-10-10 11:03:20 +01:00
committed by Tim Gover
parent 9d98c4af3b
commit 3c822369be
2 changed files with 18 additions and 0 deletions
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firmware-2711/latest/pieeprom-2024-10-10.bin Normal file
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firmware-2711/release-notes.md
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# Raspberry Pi4 bootloader EEPROM release notes
## 2024-10-10: Use soft-reset to preseve SDRAM contents after ramoops (latest)
SD card high-speed/low-voltage mode can only be exited by powercycling.
Pi 4s before rev 1.4 lack the power switch required to do this, so must
resort to a global reset that turns off many things, including SDRAM.
To ensure correct operation, the bootloader checks that the SD I/O
voltage is the expected 3.3V, forcing a power cycle if it isn't.
However, this doesn't take advantage of presence of the dedicated SD
power switch, always forcing a global reset, a consequence of which can
be the loss of SDRAM content - including any ramoops dump of the crash
logs.
Make the bootloader more SD_PWR_ON aware, only triggering a global reset
if one isn't found.
See: https://github.com/raspberrypi/linux/issues/5298
## 2024-09-05: Fix self-update if EEPROM is write-protected (latest)
* arm_dt: Consult the hat_map for all HATs
* USB boot - ignore RP2 / RP3 MSD device in BOOTSEL mode.