100 lines
3.0 KiB
Plaintext
100 lines
3.0 KiB
Plaintext
#
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# U-Boot bootscript for EMMC/SD images created by Yocto.
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#
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# As the first step in the boot script, check if we are using DualBoot. This
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# requires the script to change some variables and save them, while the rest
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# of the script changes variables only temporarily without saving them.
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# Build boot attempt message string
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if test "${bootlimit}" -gt 0 && test "${bootcount}" -gt 0; then
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bootattempt="(boot attempt ${bootcount}/${bootlimit})"
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fi
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# Dual boot verification
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if test "${dualboot}" = "yes"; then
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if test "${active_system}" = "linux_a"; then
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echo "Booting from system A ${bootattempt}"
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part number mmc ${mmcbootdev} linux_a tmp_mmcpart
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part number mmc ${mmcbootdev} rootfs_a tmp_rootfs_index
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else
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echo "Booting from system B ${bootattempt}"
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part number mmc ${mmcbootdev} linux_b tmp_mmcpart
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part number mmc ${mmcbootdev} rootfs_b tmp_rootfs_index
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fi
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part uuid mmc ${mmcbootdev}:${tmp_rootfs_index} tmp_mmcroot
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if test "${mmcpart}" -ne "${tmp_mmcpart}"; then
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setexpr mmcpart ${tmp_mmcpart}
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env_save_needed="1"
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fi
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if test "${mmcroot}" != "PARTUUID=${tmp_mmcroot}"; then
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setenv mmcroot PARTUUID=${tmp_mmcroot}
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env_save_needed="1"
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fi
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if test "${env_save_needed}" = "1"; then
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env delete tmp_mmcpart tmp_rootfs_index tmp_mmcroot
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env save
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fi
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else
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echo "Booting system ${bootattempt}"
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# Get the UUID of the configured boot partition.
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part uuid mmc ${mmcbootdev}:${mmcpart} bootpart
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# Check the boot source.
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if test "${bootpart}" = "${part1_uuid}"; then
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# We are booting from the eMMC using 'linux'.
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true
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elif test "${bootpart}" = "${part2_uuid}"; then
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# We are booting from the eMMC using 'recovery'.
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setenv boot_initrd true
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setenv initrd_file uramdisk-recovery.img
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else
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# We are booting from the SD card.
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setenv mmcroot /dev/mmcblk${mmcbootdev}p2
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fi
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fi
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# Back up environment variables
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setenv ORIG_overlays ${overlays}
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setenv ORIG_extra_bootargs ${extra_bootargs}
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# Set SOC type to "imx8mm" if not already defined by U-Boot
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if test ! -n "${soc_type}"; then
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setenv soc_type "imx8mm"
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fi
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#
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# Determine overlays to apply depending on the hardware capabilities
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# described by the HWID, SOM version, and carrier board version.
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#
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if test -n "${module_ram}"; then
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setexpr som_hv ${hwid_2} \& 38
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setexpr som_hv ${som_hv} / 8
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setexpr module_has_wifi ${hwid_2} \& 10000
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setexpr module_has_wifi ${module_has_wifi} / 10000
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setexpr module_has_bt ${hwid_2} \& 20000
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setexpr module_has_bt ${module_has_bt} / 20000
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if test "${module_has_bt}" = "1" && test -z "${disable_bt}"; then
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setenv overlays _ov_som_bt_ccimx8m.dtbo,${overlays}
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fi
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if test "${module_has_wifi}" = "1" && test -z "${disable_wifi}"; then
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setenv overlays _ov_som_wifi_ccimx8m.dtbo,${overlays}
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fi
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fi
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setenv extra_bootargs fbcon=logo-pos:center fbcon=logo-count:1 ${extra_bootargs}
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dboot linux mmc ${mmcbootdev}:${mmcpart}
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# We only get here in case of an error on the dboot command.
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# Undo changes to environment variables
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setenv overlays ${ORIG_overlays}
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setenv ORIG_overlays
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setenv extra_bootargs ${ORIG_extra_bootargs}
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setenv ORIG_extra_bootargs
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