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boards/xtensa: Remove outdated information.

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Signed-off-by: Abdelatif Guettouche <abdelatif.guettouche@espressif.com>
This commit is contained in:
Abdelatif Guettouche
2022-07-11 12:47:12 +02:00
committed by Xiang Xiao
parent 2dfe88d759
commit 6de170b154
8 changed files with 5 additions and 243 deletions
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boards/xtensa/esp32/esp32-ethernet-kit/include/board.h
+2 -37
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@@ -27,49 +27,14 @@
/* Clocking *****************************************************************/
/* The ESP32 Ethernet kit board V2 is fitted with either a 26 or a 40MHz
* crystal
*/
/* The ESP32 Ethernet kit board uses a 40 MHz crystal oscillator */
#ifdef CONFIG_ESP32_XTAL_26MHz
# define BOARD_XTAL_FREQUENCY 26000000
#else
# define BOARD_XTAL_FREQUENCY 40000000
#endif
#define BOARD_XTAL_FREQUENCY 40000000
/* Clock reconfiguration is currently disabled, so the CPU will be running
* at the XTAL frequency or at two times the XTAL frequency, depending upon
* how we load the code:
*
* - If we load the code into FLASH at address 0x1000 where it is started by
* the second level bootloader, then the frequency is the crystal
* frequency.
* - If we load the code into IRAM after the second level bootloader has run
* this frequency will be twice the crystal frequency.
*
* Don't ask me for an explanation.
*/
/* Note: The bootloader (esp-idf bootloader.bin) configures:
*
* - CPU frequency to 80MHz
* - The XTAL frequency according to the SDK config CONFIG_ESP32_XTAL_FREQ,
* which is 40MHz by default.
*
* Reference:
* https://github.com/espressif/esp-idf/blob
* /6fd855ab8d00d23bad4660216bc2122c2285d5be/components
* /bootloader_support/src/bootloader_clock.c#L38-L62
*/
#ifdef CONFIG_ESP32_RUN_IRAM
# define BOARD_CLOCK_FREQUENCY (2 * BOARD_XTAL_FREQUENCY)
#else
#ifdef CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ
# define BOARD_CLOCK_FREQUENCY (CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ * 1000000)
#else
# define BOARD_CLOCK_FREQUENCY 80000000
#endif
#endif
#endif /* __BOARDS_XTENSA_ESP32_ESP32_ETHERNET_KIT_INCLUDE_BOARD_H */