qcom: Reduce boot time by avoiding unnecessary initialization and probes - #128
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Gopinath Sekar (g-sekar) merged 4 commits intoSep 1, 2026
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qcom_configure_capsule_updates() unconditionally calls scsi_scan(), re-scanning all SCSI children even when an earlier boot stage has already bound them. Skip the rescan when UCLASS_SCSI already has devices, keeping it as a fallback if none are bound yet. ~34ms saved on Qcom SoC bootup time. Signed-off-by: Aswin Murugan <aswin.murugan@oss.qualcomm.com>
efi_disk_add_dev() runs efi_fs_exists() on every GPT partition as soon as its block device probes, even for raw partitions that are never opened as a filesystem before boot. Only the ESP needs this probe, so skip it for other GPT partitions. ~170ms saved on Qcom SoC bootup time. Signed-off-by: Aswin Murugan <aswin.murugan@oss.qualcomm.com>
CONFIG_SYS_MALLOC_CLEAR_ON_INIT zeroes the entire malloc pool at init, costing measurable boot time on the 256MB pool used by Qcom boards. Disabling it saves ~74ms on Qcom SoC bootup time. Signed-off-by: Aswin Murugan <aswin.murugan@oss.qualcomm.com>
qcom_load_fit_image() allocates the FAT-read buffer with malloc(), which is not guaranteed to be cache-line aligned and is unsafe to use with cache-line DMA. Use malloc_cache_aligned() instead. Signed-off-by: Aswin Murugan <aswin.murugan@oss.qualcomm.com>
varada-qcom
approved these changes
Sep 1, 2026
Gopinath Sekar (g-sekar)
approved these changes
Sep 1, 2026
Gopinath Sekar (g-sekar)
merged commit Sep 1, 2026
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qualcomm-linux:qcom-next
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This PR contains a set of boot time optimizations for Qualcomm SoCs,
targeting unnecessary initialization and device probing paths observed
during boot.
The changes reduce time spent in memory initialization, filesystem
probing, and redundant SCSI rescans, resulting in measurable boot KPI
improvements across Qualcomm platforms
upstream-link: https://marc.info/?l=u-boot&m=178781570076393&w=2