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stm32: rcc: clarify flash_prefetch_enable documentation

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It's not globally enabled by default, and it has consumption impacts as
well.  Reported on IRC.
This commit is contained in:
Karl Palsson
2022-11-07 14:37:30 +00:00
parent 0b414ff649
commit e1ec3e4e18
1 changed files with 7 additions and 3 deletions
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10
include/libopencm3/stm32/common/flash_common_all.h
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@@ -25,14 +25,18 @@
BEGIN_DECLS BEGIN_DECLS
/** /**
* This buffer is used for instruction fetches and is enabled by default after * This buffer is used for instruction fetches and may or may not be
* reset. * enabled by default, depending on platform. (F1: yes, most others: no)
* *
* Note carefully the clock restrictions under which the prefetch buffer may be * Note carefully the clock restrictions under which the prefetch buffer may be
* enabled or disabled. Changes are normally made while the clock is running in * enabled or disabled. Changes are normally made while the clock is running in
* the power-on low frequency mode before being set to a higher speed mode. * the power-on low frequency mode before being set to a higher speed mode.
* *
* See the reference manual for details. * Note carefully that prefetch may also results in increased consumption
* and can only improve performance on "mostly linear" workloads where there
* is at least one flash wait state.
*
* See the reference manual for your particular target for more details.
*/ */
void flash_prefetch_enable(void); void flash_prefetch_enable(void);