MTD Flash low voltage error

MTD Flash low voltage error

[Shreekanth Hiremath]

Hi  ,

We are facing some problem with JFFS2 filesystem and MTD driver as
explained below.

Two 16MB flash are connected to  CS0 EMIFS  interface of OMAP.
And the VPP for both the flash is controlled by the OMAP.
There are total 7 partitions 6 partitions on flash0 and 1 partition on
flash1.

When we mount the partition 5 (which is on flash0) and partition 6
(which is on flash1) as follows.

mount -t jffs2  /dev/mtdblock/5 /prim_jffs2
mount -t jffs2 /dev/mtdblock/6 /mirror_jffs2

And if I issue copy & delete continuously on these partitions
I am getting "Chip reports voltage low on erase: status 0xa8" error
message.

But if I issue copy &  delete on only one partition,its working fine.

By this it seems that when erase operation is done on both the flash
the "low voltage" error occurs.
The status register value is 0xa8, i.e. bit 3 (low voltage error)  & 5
(error in block erase) are set.


Regards
Shreekanth Hiremath

Re: MTD Flash low voltage error

[David Woodhouse]

On Thu, 2003-11-20 at 09:44 +0530, Shreekanth Hiremath wrote:
> Two 16MB flash are connected to  CS0 EMIFS  interface of OMAP.
> And the VPP for both the flash is controlled by the OMAP.

> And if I issue copy & delete continuously on these partitions
> I am getting "Chip reports voltage low on erase: status 0xa8" error
> message.

Sounds like a bug in your set_vpp() function. If called to set Vpp
twice, then to clear it only once, what state does it leave the GPIO pin
in?

-- 
dwmw2