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extmod/vfs_lfs: Fix lfs cache_size calculation.
The calculation of the lfs2 cache_size was incorrect, the maximum allowed size is block_size. The cache size must be: "a multiple of the read and program sizes, and a factor of the block size". Signed-off-by: Peter Züger <zueger.peter@icloud.com>
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@ -99,7 +99,7 @@ STATIC void MP_VFS_LFSx(init_config)(MP_OBJ_VFS_LFSx * self, mp_obj_t bdev, size
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config->lookahead_buffer = m_new(uint8_t, config->lookahead / 8);
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#else
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config->block_cycles = 100;
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config->cache_size = 4 * MAX(read_size, prog_size);
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config->cache_size = MIN(config->block_size, (4 * MAX(read_size, prog_size)));
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config->lookahead_size = lookahead;
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config->read_buffer = m_new(uint8_t, config->cache_size);
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config->prog_buffer = m_new(uint8_t, config->cache_size);
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