Re: [U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
On 12/05/2012 02:48:47 PM, Wolfram Sang wrote: It could happen (1 out of 100 times) that NAND did not start up correctly after warm rebooting, so we end up with various failures or DMA timed out due to a stalled BCH. When resetting BCH together with GPMI, the issue could not be observed anymore (after 1+ reboots). We probably need the consistent state already before sending commands to NAND. This behaviour was observed in barebox and kernel, so I assume it affects U-Boot as well. I chose to keep the extra reset for BCH when changing the flash layout to be on the safe side. Signed-off-by: Wolfram Sang --- Applied to u-boot-nand-flash -Scott ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
Dear Wolfram Sang, > It could happen (1 out of 100 times) that NAND did not start up correctly > after warm rebooting, so we end up with various failures or DMA timed out > due to a stalled BCH. When resetting BCH together with GPMI, the issue > could not be observed anymore (after 1+ reboots). We probably need the > consistent state already before sending commands to NAND. This behaviour > was observed in barebox and kernel, so I assume it affects U-Boot as well. > I chose to keep the extra reset for BCH when changing the flash layout to > be on the safe side. > > Signed-off-by: Wolfram Sang [...] Good, thanks. Ccing Scott to pick this up. Acked-by: Marek Vasut Best regards, Marek Vasut ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
On Wed, Dec 5, 2012 at 9:39 PM, Wolfram Sang wrote: > Both patches are correct. Check the kernel code again, please, > especially the function arguments. Ok, all is clear after reading the comments of the kernel gpmi_reset_block function. Regards, Fabio Estevam ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
On Wed, Dec 05, 2012 at 09:35:26PM -0200, Fabio Estevam wrote:
> Hi Wolfram,
>
> On Wed, Dec 5, 2012 at 6:48 PM, Wolfram Sang wrote:
>
> > diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c
> > index 4701be8..e38e151 100644
> > --- a/drivers/mtd/nand/mxs_nand.c
> > +++ b/drivers/mtd/nand/mxs_nand.c
> > @@ -1058,6 +1058,8 @@ int mxs_nand_init(struct mxs_nand_info *info)
> > {
> > struct mxs_gpmi_regs *gpmi_regs =
> > (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
> > + struct mxs_bch_regs *bch_regs =
> > + (struct mxs_bch_regs *)MXS_BCH_BASE;
> > int i = 0, j;
> >
> > info->desc = malloc(sizeof(struct mxs_dma_desc *) *
> > @@ -1081,6 +1083,7 @@ int mxs_nand_init(struct mxs_nand_info *info)
> >
> > /* Reset the GPMI block. */
> > mxs_reset_block(&gpmi_regs->hw_gpmi_ctrl0_reg);
> > + mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
>
> In your kernel patch you only do the reset for mx23, but here you do
> it for mx28.
>
> Which one is correct?
Both patches are correct. Check the kernel code again, please,
especially the function arguments.
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Re: [U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
Hi Wolfram,
On Wed, Dec 5, 2012 at 6:48 PM, Wolfram Sang wrote:
> diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c
> index 4701be8..e38e151 100644
> --- a/drivers/mtd/nand/mxs_nand.c
> +++ b/drivers/mtd/nand/mxs_nand.c
> @@ -1058,6 +1058,8 @@ int mxs_nand_init(struct mxs_nand_info *info)
> {
> struct mxs_gpmi_regs *gpmi_regs =
> (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
> + struct mxs_bch_regs *bch_regs =
> + (struct mxs_bch_regs *)MXS_BCH_BASE;
> int i = 0, j;
>
> info->desc = malloc(sizeof(struct mxs_dma_desc *) *
> @@ -1081,6 +1083,7 @@ int mxs_nand_init(struct mxs_nand_info *info)
>
> /* Reset the GPMI block. */
> mxs_reset_block(&gpmi_regs->hw_gpmi_ctrl0_reg);
> + mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
In your kernel patch you only do the reset for mx23, but here you do
it for mx28.
Which one is correct?
Regards,
Fabio Estevam
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Re: [U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
On Wed, Dec 5, 2012 at 6:48 PM, Wolfram Sang wrote:
> It could happen (1 out of 100 times) that NAND did not start up correctly
> after
> warm rebooting, so we end up with various failures or DMA timed out due to
> a
> stalled BCH. When resetting BCH together with GPMI, the issue could not be
> observed anymore (after 1+ reboots). We probably need the consistent
> state
> already before sending commands to NAND. This behaviour was observed in
> barebox
> and kernel, so I assume it affects U-Boot as well. I chose to keep the
> extra
> reset for BCH when changing the flash layout to be on the safe side.
>
> Signed-off-by: Wolfram Sang
> ---
>
> Only compile tested. Test case was to repeatedly reboot into a simple
> userspace
> on a UBI volume. Either the bootloader failed to find its data or the
> kernel
> could not mount the UBI volume once in a while. (Yes, the kernel could not
> mount the UBI although it was itself loaded correctly from NAND. So, it is
> some
> set-up issue.) This was nasty to debug, so I thought I let you know...
>
> drivers/mtd/nand/mxs_nand.c |3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c
> index 4701be8..e38e151 100644
> --- a/drivers/mtd/nand/mxs_nand.c
> +++ b/drivers/mtd/nand/mxs_nand.c
> @@ -1058,6 +1058,8 @@ int mxs_nand_init(struct mxs_nand_info *info)
> {
> struct mxs_gpmi_regs *gpmi_regs =
> (struct mxs_gpmi_regs *)MXS_GPMI_BASE;
> + struct mxs_bch_regs *bch_regs =
> + (struct mxs_bch_regs *)MXS_BCH_BASE;
> int i = 0, j;
>
> info->desc = malloc(sizeof(struct mxs_dma_desc *) *
> @@ -1081,6 +1083,7 @@ int mxs_nand_init(struct mxs_nand_info *info)
>
> /* Reset the GPMI block. */
> mxs_reset_block(&gpmi_regs->hw_gpmi_ctrl0_reg);
> + mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
>
A comment here why this is need would be nice.
> /*
> * Choose NAND mode, set IRQ polarity, disable write protection and
> --
> 1.7.10.4
>
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[U-Boot] [PATCH] mtd: nand: mxs: reset BCH earlier, too, to avoid NAND startup problems
It could happen (1 out of 100 times) that NAND did not start up correctly after
warm rebooting, so we end up with various failures or DMA timed out due to a
stalled BCH. When resetting BCH together with GPMI, the issue could not be
observed anymore (after 1+ reboots). We probably need the consistent state
already before sending commands to NAND. This behaviour was observed in barebox
and kernel, so I assume it affects U-Boot as well. I chose to keep the extra
reset for BCH when changing the flash layout to be on the safe side.
Signed-off-by: Wolfram Sang
---
Only compile tested. Test case was to repeatedly reboot into a simple userspace
on a UBI volume. Either the bootloader failed to find its data or the kernel
could not mount the UBI volume once in a while. (Yes, the kernel could not
mount the UBI although it was itself loaded correctly from NAND. So, it is some
set-up issue.) This was nasty to debug, so I thought I let you know...
drivers/mtd/nand/mxs_nand.c |3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c
index 4701be8..e38e151 100644
--- a/drivers/mtd/nand/mxs_nand.c
+++ b/drivers/mtd/nand/mxs_nand.c
@@ -1058,6 +1058,8 @@ int mxs_nand_init(struct mxs_nand_info *info)
{
struct mxs_gpmi_regs *gpmi_regs =
(struct mxs_gpmi_regs *)MXS_GPMI_BASE;
+ struct mxs_bch_regs *bch_regs =
+ (struct mxs_bch_regs *)MXS_BCH_BASE;
int i = 0, j;
info->desc = malloc(sizeof(struct mxs_dma_desc *) *
@@ -1081,6 +1083,7 @@ int mxs_nand_init(struct mxs_nand_info *info)
/* Reset the GPMI block. */
mxs_reset_block(&gpmi_regs->hw_gpmi_ctrl0_reg);
+ mxs_reset_block(&bch_regs->hw_bch_ctrl_reg);
/*
* Choose NAND mode, set IRQ polarity, disable write protection and
--
1.7.10.4
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