SPI Memory Support in Linux and U-Boot
summary
SPI memories move from tiny EEPROMs to primary storage using SPI NOR and SPI NAND, with throughput jumping from ~10 MHz to ~100 MHz and dual/quad/octo IO plus DDR. Linux’s spi-mem and mtd stack plus the m25p glue are ported and reworked into U-Boot: an spi-mem framework, an entity device/command, automatic MTD partition updates, and controller hooks for direct mapping are merged and functional (merged in the recent U-Boot alpha), with NAND page reads (typically 2 KiB) and fallback transfer paths preserved.
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