Make sure the whole RTT structure is in RAM #683
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Currently, the name field of the RTT channel will be placed in flash (rodata). That causes the debug probe to read from flash while parsing the RTT header. Usually this doesn't matter, but if the firmware disables flash access before the debug probe scanned the header, it will break. The situation where I stumbled over this was writing a firmware which writes to flash on an RP2040. While writing to the (external) flash chip, no concurrent flash accesses must happen. This patch forces the name to the `.data` section, so the whole RTT header can be read from RAM.
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Thank you for the PR! @jonas-schievink can you please take a brief look? |
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Could you add an inline comment explaining the reasoning? Other than that, this seems reasonable |
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bors r=jonas-schievink |
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Build succeeded: |
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Currently, the name field of the RTT channel will be placed in
flash (rodata). That causes the debug probe to read from flash while
parsing the RTT header.
Usually this doesn't matter, but if the firmware disables flash access
before the debug probe scanned the header, it will break.
The situation where I stumbled over this was writing a firmware which
writes to flash on an RP2040. While writing to the (external) flash
chip, no concurrent flash accesses must happen.
This patch forces the name to the
.datasection, so the whole RTTheader can be read from RAM.