espflash: Reduce the memory fragmentation during flash write. #654
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espflash used to implicitely allocate four times per write the ~4k buffer for the data. That caused devices with smaller memory to fail due to memory fragmentation. This change reduces it to once per block. Signed-off-by: robert-hh <robert@hammelrath.com>
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espflash used to implicitely allocate four times per write the ~4k buffer for the data. That caused boards with smaller memory to fail due to memory fragmentation. This change reduces the allocation to once per block.