Re: [PATCH v3] mtd/nand : workaround for Freescale FCM to support large-page Nand chip

Scott Wood a écrit :

On 08/22/2011 11:13 AM, Matthieu CASTET wrote:

quoted

Scott Wood a écrit :

quoted

To eliminate it we'd need to do an extra data transfer without reissuing
the command, which Shuo was unable to get to work.

That's weird because our controller seems quite flexible [1].

Something like that should work ?

            out_be32(&lbc->fir,
                     (FIR_OP_CM2 << FIR_OP0_SHIFT) |
                     (FIR_OP_CA  << FIR_OP1_SHIFT) |
                     (FIR_OP_PA  << FIR_OP2_SHIFT) |
                     (FIR_OP_WB  << FIR_OP3_SHIFT));
refill FCM buffer with next 2k data

            out_be32(&lbc->fir,
                     (FIR_OP_WB  << FIR_OP3_SHIFT) |
                     (FIR_OP_CM3 << FIR_OP4_SHIFT) |
                     (FIR_OP_CW1 << FIR_OP5_SHIFT) |
                     (FIR_OP_RS  << FIR_OP6_SHIFT));

Something like that is what I originally suggested, but Shuo said it
didn't work (even in theory, it requires a CE-don't-care NAND chip,
since bus atomicity is broken).

Are there 4K chip that are not CE-don't-care ?

Also I think it depends how the bus are connected  (shared with other device)
and the controller.

Matthieu