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Date: Wed, 29 Aug 2012 17:20:17 +0200
From: Roland Stigge <stigge@...com.de>
To: Sascha Hauer <s.hauer@...gutronix.de>
CC: linux-mtd@...ts.infradead.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: mxc_nand.c on mach-imx/imx53
Hi Sascha,
On 08/29/2012 09:41 AM, Sascha Hauer wrote:
> On Thu, Aug 23, 2012 at 11:30:54AM +0200, Roland Stigge wrote:
>> Hi,
>>
>> I'd like to know about the current state of mxc_nand.c on imx53, because
>> I got an error on probe() because the clock that mxc_nand is requesting
>> is "nfc" but imx53 only defines the clock "mxc_nand".
>
> The driver generally works on i.MX53, only some pieces are missing. I
> just resent the corresponding series and put you on Cc.
Good - thank you for the patches, didn't know about them.
Now, my flash is detected:
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xdc (Micron NAND 512MiB
3,3V 8-bit), page size: 4096, OOB size: 128
However, when I read a partition, kernel (mxc_nand_correct_data_v2_v3())
says:
...
UnCorrectable RS-ECC Error
UnCorrectable RS-ECC Error
UnCorrectable RS-ECC Error
UnCorrectable RS-ECC Error
UnCorrectable RS-ECC Error
UnCorrectable RS-ECC Error
UnCorrectable RS-ECC Error
...
I'm using the following dt (on an Emtrion DIMM-MX53 board):
nand@...db000 {
status = "okay";
#address-cells = <1>;
#size-cells = <1>;
nand-bus-width = <8>;
nand-ecc-mode = "hw";
mtd0@...00000 {
label = "bootstrap";
reg = <0x00000000 0x80000>;
read-only;
};
mtd1@...80000 {
label = "uboot";
reg = <0x00080000 0x80000>;
read-only;
};
mtd2@...00000 {
label = "NVRAM";
reg = <0x00100000 0x100000>;
};
mtd3@...00000 {
label = "bootlogo";
reg = <0x00200000 0x80000>;
};
mtd4@...80000 {
label = "linux";
reg = <0x00280000 0x400000>;
};
mtd5@...80000 {
label = "rootfs";
reg = <0x00680000 0x8000000>;
};
mtd6@...80000 {
label = "appfs";
reg = <0x08680000 0x17980000>;
};
};
NAND info from u-boot:
NAND: 512 MiB
Manufacturer : Micron (0x2c)
Device Code : 0xdc
Cell Technology : SLC
Chip Size : 512 MiB
Pages per Block : 64
Page Geometry : 4096+218
ECC Strength : 8 bits
ECC Size : 512 B
Data Setup Time : 20 ns
Data Hold Time : 10 ns
Address Setup Time: 10 ns
GPMI Sample Delay : 6 ns
tREA : Unknown
tRLOH : Unknown
tRHOH : Unknown
Description : MT29F4G08ABAEA
I guess I hit a documented open issue:
/* v3.2b: i.MX53 */
static const struct mxc_nand_devtype_data imx53_nand_devtype_data = {
.preset = preset_v3,
.send_cmd = send_cmd_v3,
.send_addr = send_addr_v3,
.send_page = send_page_v3,
.send_read_id = send_read_id_v3,
.get_dev_status = get_dev_status_v3,
.check_int = check_int_v3,
.irq_control = irq_control_v3,
.get_ecc_status = get_ecc_status_v3,
.ecclayout_512 = &nandv2_hw_eccoob_smallpage,
.ecclayout_2k = &nandv2_hw_eccoob_largepage,
.ecclayout_4k = &nandv2_hw_eccoob_smallpage, /* XXX: needs fix */
Using ".ecclayout_4k = &nandv2_hw_eccoob_4k" also doesn't work. So is
there any hint how I can proceed from here? Any plans or hint regarding
the "XXX"?
Thanks in advance,
Roland
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