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stmhal: Add ability to skip booting from SD card via /flash/SKIPSD file.

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This commit is contained in:
Damien George 2017-02-07 12:35:39 +11:00
parent de48a27d60
commit 9779c99317
2 changed files with 9 additions and 1 deletions
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5
docs/pyboard/general.rst
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@ -11,6 +11,11 @@ is inserted into the slot, it is available as ``/sd``.
When the pyboard boots up, it needs to choose a filesystem to boot from. If
there is no SD card, then it uses the internal filesystem ``/flash`` as the boot
filesystem, otherwise, it uses the SD card ``/sd``.
If needed, you can prevent the use of the SD card by creating an empty file
called ``/flash/SKIPSD``. If this file exists when the pyboard boots
up then the SD card will be skipped and the pyboard will always boot from the
internal filesystem (in this case the SD card won't be mounted but you can still
mount and use it later in your program using ``os.mount``).
(Note that on older versions of the board, ``/flash`` is called ``0:/`` and ``/sd``
is called ``1:/``).

5
stmhal/main.c
View File

@ -568,7 +568,10 @@ soft_reset:
#if MICROPY_HW_HAS_SDCARD
// if an SD card is present then mount it on /sd/
if (sdcard_is_present()) {
mounted_sdcard = init_sdcard_fs(first_soft_reset);
// if there is a file in the flash called "SKIPSD", then we don't mount the SD card
if (!mounted_flash || f_stat(&fs_user_mount_flash.fatfs, "/SKIPSD", NULL) != FR_OK) {
mounted_sdcard = init_sdcard_fs(first_soft_reset);
}
}
#endif