2021-08-21 08:54:34 +00:00
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From e32f7ddc830c3388a68dfe34881bce32afded0b9 Mon Sep 17 00:00:00 2001
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From: Tim Gover <tim.gover@raspberrypi.com>
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Date: Tue, 20 Oct 2020 11:55:37 +0100
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Subject: [PATCH] firmware: raspberrypi: Add support for tryonce reboot
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flag
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Define a new mailbox (SET_REBOOT_FLAGS) which may be used to
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pass optional flags to the Raspberry Pi firmware that changes
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the behaviour of the bootloader and firmware during a reboot.
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Currently this just defines the 'tryboot' flag which causes
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the firmware to load tryboot.txt instead config.txt. This
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alternate configuration file can be used to specify the
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path of an alternate firmware and kernels allowing a fallback
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mechanism to be implemented for OS upgrades.
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---
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drivers/firmware/raspberrypi.c | 25 ++++++++++++++++++++--
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include/soc/bcm2835/raspberrypi-firmware.h | 2 ++
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2 files changed, 25 insertions(+), 2 deletions(-)
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--- a/drivers/firmware/raspberrypi.c
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+++ b/drivers/firmware/raspberrypi.c
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2021-09-15 09:31:37 +00:00
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@@ -194,6 +194,7 @@ static int rpi_firmware_notify_reboot(st
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2021-08-21 08:54:34 +00:00
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{
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struct rpi_firmware *fw;
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struct platform_device *pdev = g_pdev;
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+ u32 reboot_flags = 0;
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if (!pdev)
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return 0;
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2021-09-15 09:31:37 +00:00
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@@ -202,8 +203,28 @@ static int rpi_firmware_notify_reboot(st
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2021-08-21 08:54:34 +00:00
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if (!fw)
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return 0;
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- (void)rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT,
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- 0, 0);
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+ // The partition id is the first parameter followed by zero or
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+ // more flags separated by spaces indicating the reason for the reboot.
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+ //
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+ // 'tryboot': Sets a one-shot flag which is cleared upon reboot and
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+ // causes the tryboot.txt to be loaded instead of config.txt
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+ // by the bootloader and the start.elf firmware.
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+ //
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+ // This is intended to allow automatic fallback to a known
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+ // good image if an OS/FW upgrade fails.
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+ //
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+ // N.B. The firmware mechanism for storing reboot flags may vary
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+ // on different Raspberry Pi models.
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+ if (data && strstr(data, " tryboot"))
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+ reboot_flags |= 0x1;
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+
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+ // The mailbox might have been called earlier, directly via vcmailbox
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+ // so only overwrite if reboot flags are passed to the reboot command.
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+ if (reboot_flags)
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+ (void)rpi_firmware_property(fw, RPI_FIRMWARE_SET_REBOOT_FLAGS,
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+ &reboot_flags, sizeof(reboot_flags));
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+
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+ (void)rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT, NULL, 0);
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return 0;
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}
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--- a/include/soc/bcm2835/raspberrypi-firmware.h
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+++ b/include/soc/bcm2835/raspberrypi-firmware.h
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@@ -96,6 +96,8 @@ enum rpi_firmware_property_tag {
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RPI_FIRMWARE_GET_POE_HAT_VAL = 0x00030049,
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RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00030050,
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RPI_FIRMWARE_NOTIFY_XHCI_RESET = 0x00030058,
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+ RPI_FIRMWARE_GET_REBOOT_FLAGS = 0x00030064,
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+ RPI_FIRMWARE_SET_REBOOT_FLAGS = 0x00038064,
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/* Dispmanx TAGS */
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RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE = 0x00040001,
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