Add TBYB safe rom_pick_ab_partition function #1850
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kilograham
reviewed
Aug 22, 2024
| @@ -7,6 +7,9 @@ | |||
| #include "pico/bootrom.h" | |||
| #include "boot/picoboot.h" | |||
| #include "boot/picobin.h" | |||
| #if !PICO_RP2040 | |||
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strictly more idiomatic to use #if HAS_RP2040_RTC
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This is the RCP not the RTC - given the functions in this file are also guarded by !PICO_RP2040 I think this if fine to use here too?
kilograham
reviewed
Aug 22, 2024
| @@ -0,0 +1,211 @@ | |||
| #include "boot/picobin.h" | |||
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I'm really not a fan of exposing this header of structs. It implies that this is a public API, which it isn't
Can we try with just using memory offsets, and then we need to guard with the rom_version also.
lurch
reviewed
Oct 3, 2024
| /*! \brief Pick A/B partition for a separate partition | ||
| * \ingroup pico_bootrom | ||
| * | ||
| * This will perform extra checks to prevent disrupting a main image TBYB, and return errors |
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Might want to reword this slightly? "This will ... return errors" 😉
will-v-pi
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Superseded by #1969 - that adds this function plus a use of it |
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This PR adds an extra wrapper around
rom_pick_ab_partition, which makes it safer when called during a TBYB boot, and includes a call to get the flash_update_baseCurrently, when doing a flash update boot which requires a flash erase, if you call
pick_ab_partitionbefore callingexplicit_buy(eg to pick a firmware partition or similar) then it will clearalways->zero_init.version_downgrade_erase_flash_addr. This means the subsequentexplicit_buycall will not perform the required flash erase, which means the flash update boot will not succeed.This adds saving and restoring the
erase_flash_addrto prevent this happening, while still allowing theerase_flash_addrto be set if the firmware partition is being updated and requires a flash eraseThis also adds setting up
always->zero_init.tbyb_flag_flash_addrto allow for TBYB executables in the firmware partition to have the address set up correctlyThe function returns an error if too many things are updating at once - either if both the boot and firmware images are TBYB, or if the boot and firmware images both require a flash erase
It also returns an error if the chosen image was not verified, which acts as a signature check on the firmware image