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Speed difference between 8 or 16 bit nand flash

PMort.1
Associate II

‎2020-04-01 09:14 AM

Does anyone have some real data on speed difference between 8 or 16 bit Nand flash (with the bootloader and the kernel) on the STM32MP157 ?

  • at boot
  • during normal operation
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Bernard PUEL
ST Employee

‎2020-04-08 07:27 AM

Hello,

here are some figures (to give an idea) we did some time ago on kernel side. As you can see, it is highly depending on NAND used:

SLC NAND on read operations:

  • The Kernel is more optimized with ONFI SLC NAND:
    • Micron x8 we could reach 11 to 12 MB/s
    • Micron x16 we could reach 16 to 17 MB/s
  • For non ONFI devices, only kernel default timings:
    • Toshiba x8 we could reach 6 MB/s

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