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WL1801MOD: wl18xx sdio detection problem

Part Number: WL1801MOD

A small percentage of WL1801MOD modules do not respond to the low frequency INIT phase of SDIO.
If I add a 100K pullup to WLAN_IRQ, I see a working module pull that signal low 170ms after VBAT comes up.
On a failing module, WLAN_IRQ does not pull this signal low, nor does it respond to SD INIT. 

Where can I find docs on RS232_DEBUG usage?