2000/1211/bitsy/devflash.c (diff list | history)

2000/1209/sys/src/9/bitsy/devflash.c:653,667 – 2000/1211/sys/src/9/bitsy/devflash.c:653,669 (short | long | prev | next)
2000/1209		* the flash spec claimes writing goes faster if we use
2000/1117		* the write buffer. We fill the write buffer and then * issue the write request. After the write request, * subsequent reads will yield the status register or, * since error bits are sticky, another write buffer can * be filled and written.
2000/1211		* subsequent reads will yield the status register.
2000/1117		* * On timeout, we issue a read status register request so * that the status register can be read no matter how we * exit.
2000/1211		* returns the status, even on timeouts.
2000/1209		* * returns the status.
2000/1211		* NOTE: I tried starting back to back buffered writes * without reading the status in between, as the * flowchart in the intel data sheet suggests. * However, it always responded with an illegal * command sequence, so I must be missing something. * If someone learns better, please email me, though * I doubt it will be much faster. - presotto@bell-labs.com
2000/1117		*/
2000/1209		static ulong ise_wbwrite(ulong *p, int n, ulong off, ulong baddr, ulong *status)