Support for S29JL064 in MPC8272ADS?

Sat Oct 17 02:55:12 EST 2009

Sorry I made a typo: LITTLE endian byte swap is enabled for Flash Chip drivers:
CONFIG_MTD_CFI_LE_BYTE_SWAP=y

On Fri, Oct 16, 2009 at 11:37 AM, Roberto Guerra
<roberto.j.guerra at gmail.com> wrote:
> In the last few days, I made this progress (<snip> indicates where I
> cropped the file to the relevant sections):
>
> $ cat myboard.dts
> <snip>
>        localbus at f0010100 {
>                compatible = "fsl,mpc8280-localbus",
>                             "fsl,pq2-localbus";
>                #address-cells = <2>;
>                #size-cells = <1>;
>                reg = <f0010100 60>;
>
>                ranges = <0 0 ffe00000 00800000>;
>
>                flash at 0,0 {
>                        compatible = "cfi-flash";
>                        reg = <0 0 800000>;
>                        bank-width = <2>;
>                        device-width = <2>;
>                };
>        };
> <snip>
>
> $ cat linux/.config
> <snip>
> #
> # Generic Driver Options
> #
> CONFIG_MTD=y
> CONFIG_MTD_DEBUG=y
> CONFIG_MTD_DEBUG_VERBOSE=3
> # CONFIG_MTD_CONCAT is not set
> CONFIG_MTD_PARTITIONS=y
> # CONFIG_MTD_REDBOOT_PARTS is not set
> CONFIG_MTD_CMDLINE_PARTS=y
> # CONFIG_MTD_OF_PARTS is not set
> #
> # User Modules And Translation Layers
> #
> # CONFIG_MTD_CHAR is not set
> # CONFIG_MTD_BLKDEVS is not set
> # CONFIG_MTD_BLOCK is not set
> # CONFIG_MTD_BLOCK_RO is not set
> # CONFIG_FTL is not set
> # CONFIG_NFTL is not set
> # CONFIG_INFTL is not set
> # CONFIG_RFD_FTL is not set
> # CONFIG_SSFDC is not set
> # CONFIG_MTD_OOPS is not set
> #
> # RAM/ROM/Flash chip drivers
> #
> CONFIG_MTD_CFI=y
> # CONFIG_MTD_JEDECPROBE is not set
> CONFIG_MTD_GEN_PROBE=y
> CONFIG_MTD_CFI_ADV_OPTIONS=y
> # CONFIG_MTD_CFI_NOSWAP is not set
> # CONFIG_MTD_CFI_BE_BYTE_SWAP is not set
> CONFIG_MTD_CFI_LE_BYTE_SWAP=y
> CONFIG_MTD_CFI_GEOMETRY=y
> # CONFIG_MTD_MAP_BANK_WIDTH_1 is not set
> CONFIG_MTD_MAP_BANK_WIDTH_2=y
> # CONFIG_MTD_MAP_BANK_WIDTH_4 is not set
> # CONFIG_MTD_MAP_BANK_WIDTH_8 is not set
> # CONFIG_MTD_MAP_BANK_WIDTH_16 is not set
> # CONFIG_MTD_MAP_BANK_WIDTH_32 is not set
> CONFIG_MTD_CFI_I1=y
> # CONFIG_MTD_CFI_I2 is not set
> # CONFIG_MTD_CFI_I4 is not set
> # CONFIG_MTD_CFI_I8 is not set
> # CONFIG_MTD_OTP is not set
> # CONFIG_MTD_CFI_INTELEXT is not set
> CONFIG_MTD_CFI_AMDSTD=y
> # CONFIG_MTD_CFI_STAA is not set
> CONFIG_MTD_CFI_UTIL=y
> # CONFIG_MTD_RAM is not set
> # CONFIG_MTD_ROM is not set
> # CONFIG_MTD_ABSENT is not set
> #
> # Mapping drivers for chip access
> #
> # CONFIG_MTD_COMPLEX_MAPPINGS is not set
> CONFIG_MTD_PHYSMAP=y
> CONFIG_MTD_PHYSMAP_START=0xff800000
> CONFIG_MTD_PHYSMAP_LEN=0x800000
> CONFIG_MTD_PHYSMAP_BANKWIDTH=2
> # CONFIG_MTD_PHYSMAP_OF is not set
> # CONFIG_MTD_INTEL_VR_NOR is not set
> # CONFIG_MTD_PLATRAM is not set
> #
> # Self-contained MTD device drivers
> #
> # CONFIG_MTD_PMC551 is not set
> # CONFIG_MTD_SLRAM is not set
> # CONFIG_MTD_PHRAM is not set
> # CONFIG_MTD_MTDRAM is not set
> # CONFIG_MTD_BLOCK2MTD is not set
> <snip>
>
> => tftpboot 200000 uImage
> => tftpboot 400000 myboard.dtb
> => echo $bootargs
> console=ttyCPM0,115200 root=/dev/mtdblock1 rw
> mtdparts=phys:1600K(ROM)ro,6M(root),512K(U-Boot)ro,512K(unused)
> rootfstype=jffs2
> => bootm 200000 - 400000
> <snip>
> physmap platform flash device: 00800000 at ff800000
> physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
>  Amd/Fujitsu Extended Query Table at 0x0040
> physmap-flash.0: CFI does not contain boot bank location. Assuming
> top.
> number of CFI chips: 1
> cfi_cmdset_0002: Disabling erase-suspend-program due to code
> brokenness.
> RedBoot partition parsing not available
> mtd: Giving out device 0 to physmap-flash.0
> mice: PS/2 mouse device common for all mice
> TCP cubic registered
> NET: Registered protocol family 1
> NET: Registered protocol family 17
> RPC: Registered udp transport module.
> RPC: Registered tcp transport module.
> Root-NFS: No NFS server available, giving up.
> VFS: Unable to mount root fs via NFS, trying floppy.
> MTDSB: dev_name "/dev/root"
> MTDSB: path_lookup() returned 0, inode c1400aa0
> List of all partitions:
> 0100       4096 ram0 (driver?)
> 0101       4096 ram1 (driver?)
> 0102       4096 ram2 (driver?)
> 0103       4096 ram3 (driver?)
> 0104       4096 ram4 (driver?)
> 0105       4096 ram5 (driver?)
> 0106       4096 ram6 (driver?)
> 0107       4096 ram7 (driver?)
> 0108       4096 ram8 (driver?)
> 0109       4096 ram9 (driver?)
> 010a       4096 ram10 (driver?)
> 010b       4096 ram11 (driver?)
> 010c       4096 ram12 (driver?)
> 010d       4096 ram13 (driver?)
> 010e       4096 ram14 (driver?)
> 010f       4096 ram15 (driver?)
> No filesystem could mount root, tried:  jffs2
> Kernel panic - not syncing: VFS: Unable to mount root fs on
> unknown-block(2,0)
> Rebooting in 180 seconds..
>
> The key change in my kernel config was the BIG_ENDIAN=Y.
> The kernel probes the AMD chip, but it can't see the partitions.
> I guess now I will have to define my mtd partitions in either FDT or
> in the kernel arguments.
> Which is the best way to define them? If the partitions are defined in
> both FDT and bootargs, which one takes precedence?
>
> -Roberto
>
>
> On Wed, Oct 14, 2009 at 5:40 PM, Scott Wood <scottwood at freescale.com> wrote:
>> Roberto Guerra wrote:
>>>
>>> I've been learning how to modify the dts from
>>>
>>> http://www.mjmwired.net/kernel/Documentation/powerpc/dts-bindings/mtd-physmap.txt#49
>>> The original mpc8272ads.dts represents four 8-bit JEDEC Sharp flash
>>> chips in 1 SIMM module:
>>> [snip]        localbus at f0010100 {
>>>                compatible = "fsl,mpc8280-localbus",
>>>                             "fsl,pq2-localbus";
>>>                #address-cells = <2>;
>>>                #size-cells = <1>;
>>>                reg = <f0010100 60>;
>>>
>>>                ranges = <0 0 fe000000 00800000
>>>                          1 0 f4500000 00008000
>>>                          8 0 f8200000 00008000>;
>>>
>>>                flash at 0,0 {
>>>                        compatible = "jedec-flash";
>>>                        reg = <0 0 800000>;
>>>                        bank-width = <4>;
>>>                        device-width = <1>;
>>>                };
>>> [snip]
>>> My board (based on the PQ2FADS, using the MPC8272ADS BSP)
>>
>> Don't base anything on the BSPs, unless there's something in them that you
>> really need that isn't upstream.  There is pq2fads support in current
>> upstream kernels.
>>
>>> uses one
>>> 16-bit Spansion (AMD) CFI chip at addresses FF800000 through FFFFFFFF.
>>> It probably needs to be represented this way (I've only made changes
>>> to the "flash" section.
>>> [snip]
>>>                flash at 0,0 {
>>>                        compatible = "amd, s29jl064h", "cfi-flash";
>>>                        reg = <0 0 800000>;
>>>                        bank-width = <2>;
>>>                        device-width = <2>;
>>>                };
>>> [snip]
>>> However, I don't know what would be the correct addresses to type
>>> after "localbus", "flash" and "reg". Is this enough information to
>>> define my dts?
>>
>> The flash node looks good, other than that there shouldn't be a space after
>> "amd,".
>>
>> In the localbus node, change fe000000 to ff800000.  Remove or change the
>> other ranges entries if they don't describe your board's chipselects.
>>
>> If your IMMR is somewhere other than 0xf0000000, update the f0010100 to
>> match.
>>
>> -Scott
>>
>>
>