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1e2d86201f
This reverts commit8f48a62,9af8782, andbd3e71b. Commit8f48a62extends tx to 2M, resulting in the tx_float bss section reaching a size of 4M. This isn't a issue on devices with normal memory sizes and OS supporting virtual memory. But it's a real issue for embedded devices with realtime OS, which may not support virtual memory, e.g., Nuttx. This 4M of bss section map to physical memory directly, which is a scarce resource on embedded devices.