[U-Boot] U-boot: Erase/read/write issue with S25fl256S flash device
Jagan Teki
jagannadh.teki at gmail.com
Mon Jun 17 08:47:57 CEST 2013
Hi Sourav,
On Mon, Jun 17, 2013 at 11:44 AM, Sourav Poddar <sourav.poddar at ti.com> wrote:
> Hi Jagan,
>
> On Saturday 15 June 2013 09:47 PM, Jagan Teki wrote:
>>
>> On 14-06-2013 20:13, Sourav Poddar wrote:
>>>
>>> Hi Jagan,
>>> On Friday 14 June 2013 08:08 PM, Jagan Teki wrote:
>>>>
>>>> On 14-06-2013 20:03, Sourav Poddar wrote:
>>>>>
>>>>>
>>>>> Hi,
>>>>>
>>>>> On Wednesday 12 June 2013 01:00 PM, Sourav Poddar wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I am working on qspi flash device S25FL256S at u-boot level. I am
>>>>>> trying to
>>>>>> make use of the existing spi_flash.c framework available at u-boot for
>>>>>> erasing/reading/writing
>>>>>> into the flash device.
>>>>>>
>>>>>> There are several issues(mentioned below), which I faced while using
>>>>>> S25FL256s flash device
>>>>>> with my dra7xx board which has a qspi controller to which the above
>>>>>> mentioned flash device is attached.
>>>>>>
>>>>>> 1. Erase (spi_flash_cmd_erase)
>>>>>>
>>>>>> Issuing a command something like this..
>>>>>>
>>>>>> sf erase 0x0 0x50000
>>>>>> - erases only first 0x20000 bytes of flash device, anything above
>>>>>> that is not erase. I need to
>>>>>> issue separate commands after 0x20000 for every 0x10000 bytes.
>>>>>>
>>>>>> Am i missing anything here?
>>>>>>
>>>>>> 2. read
>>>>>>
>>>>>> sf read 81000000 0 0x10000
>>>>>>
>>>>>> Read is not happening properly. The last few byte along the 4k
>>>>>> boundary always shows zero.
>>>>>> Above 4k bytes, read is not happening.
>>>>>>
>>>>>> For ex:
>>>>>> DRA752 EVM # md 81000f00
>>>>>> 81000f00: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f10: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f20: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f30: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f40: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f50: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f60: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f70: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f80: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000f90: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000fa0: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000fb0: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000fc0: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000fd0: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000fe0: ffffffff ffffffff ffffffff ffffffff ................
>>>>>> 81000ff0: ffffffff ffffffff 00ffffff 00000000 ................
>>>>>>
>>>>>> In this dump, if you see 81000ff0 the last column shows 000000 which
>>>>>> is
>>>>>> not expected. and it happens along every 4k bytes.
>>>>>>
>>>>>>
>>>>>> So, to get rid of the above issue, I switched to page read with the
>>>>>> below patch[1],
>>>>>> which is giving me the correct result.
>>>>>> [1]:
>>>>>> @@ -147,17 +153,40 @@ int spi_flash_read_common(struct spi_flash
>>>>>> *flash, const u8 *cmd,
>>>>>> int spi_flash_cmd_read_fast(struct spi_flash *flash, u32 offset,
>>>>>> size_t len, void *data)
>>>>>> {
>>>>>> - u8 cmd[5];
>>>>>> + unsigned long page_addr, byte_addr, page_size;
>>>>>> + size_t chunk_len, actual;
>>>>>> + int ret = 0;
>>>>>> + u8 cmd[4];
>>>>>>
>>>>>> /* Handle memory-mapped SPI */
>>>>>> if (flash->memory_map)
>>>>>> memcpy(data, flash->memory_map + offset, len);
>>>>>> + page_size = flash->page_size;
>>>>>> + page_addr = offset / page_size;
>>>>>> + byte_addr = offset % page_size;
>>>>>> +
>>>>>> + cmd[0] = CMD_READ_ARRAY_SLOW;
>>>>>> + for (actual = 0; actual < len; actual += chunk_len) {
>>>>>> + chunk_len = min(len - actual, page_size - byte_addr);
>>>>>> +
>>>>>> + cmd[1] = page_addr >> 8;
>>>>>> + cmd[2] = page_addr;
>>>>>> + cmd[3] = byte_addr;
>>>>>> +
>>>>>> + ret = spi_flash_read_common(flash, cmd, sizeof(cmd),
>>>>>> data + actual, chunk_len);
>>>>>> + if (ret < 0) {
>>>>>> + debug("SF: read failed");
>>>>>> + break;
>>>>>> + }
>>>>>>
>>>>>> - cmd[0] = CMD_READ_ARRAY_FAST;
>>>>>> - spi_flash_addr(offset, cmd);
>>>>>> - cmd[4] = 0x00;
>>>>>> + byte_addr += chunk_len;
>>>>>> + if (byte_addr == page_size) {
>>>>>> + page_addr++;
>>>>>> + byte_addr = 0;
>>>>>> + }
>>>>>> + }
>>>>>>
>>>>>> - return spi_flash_read_common(flash, cmd, sizeof(cmd), data,
>>>>>> len);
>>>>>> + return ret;
>>>>>> }
>>>>>>
>>>>>> Any idea about this?
>>>>>>
>>>>>> 3. write (spi_flash_cmd_write_multi)
>>>>>> write not happening properly.
>>>>>>
>>>>>> observations: only able to write single page, anything after a page is
>>>>>> not getting
>>>>>> written.
>>>>>> Workaround:
>>>>>> I did a write disable latch at the end of every write cycle(page
>>>>>> program) and enable it
>>>>>> again for the next loop. With this, I see I get rid of the above
>>>>>> issue.
>>>>>>
>>>>>> @@ -117,6 +117,12 @@ int spi_flash_cmd_write_multi(struct spi_flash
>>>>>> *flash, u32 offset,
>>>>>> if (ret)
>>>>>> break;
>>>>>>
>>>>>> + ret = spi_flash_cmd_write_disable(flash);
>>>>>> + if (ret < 0) {
>>>>>> + printf("SF: disabling write failed\n");
>>>>>> + break;
>>>>>> + }
>>>>>> +
>>>>>>
>>>>>>
>>>>>> Have anyone seen the above mentioned issues regarding
>>>>>> read/write/erase? OR is there any
>>>>>> configurations that I might be missing ?
>>>>>>
>>>>> Any Input on this?
>>>>
>>>>
>>>> Please wait, I am pushing some changes tonight or so.
>>>>
>>>> We will continue this thread, after testing your part with these new
>>>> changes.
>>>>
>>>> I will intimate you once the push done.
>>>>
>>>> --
>>>> Thanks,
>>>> Jagan.
>>>>
>>>>
>>> Thanks a lot for the reply.
>>> Sure, will wait for your changes to go in.
>>
>>
>> Will take some time go these changes on master.
>>
>> Please checkout master-work branch in u-boot-spi repo
>> git://git.denx.de/u-boot-spi.git
>>
>> and try to test 256S parts, fyi: I tested the same part got the
>> +ve result.
>>
> Tested the above tree on my board.
> But, still the issues remain the same for me in all the three
> cases(erase/read/write).
>
> Here is the short log of the read command..
> DRA752 EVM # sf probe 0
> SF: Detected S25FL256S_64K with page size 64 KiB, total 32 MiB
> SF: Warning - Only lower 16MiB accessible, Full access #define
> CONFIG_SPI_FLASH_BAR
> DRA752 EVM # sf erase 0x0 0x10000
> SF: 65536 bytes @ 0x0 Erased: OK
> DRA752 EVM # mw.b 0x81000100 0xff 0x10000
> DRA752 EVM # sf read 0x81003000 0x0 0x10000
> SF: 65536 bytes @ 0x0 Read: OK
> DRA752 EVM # cmp.b 0x81003000 0x81000100 0x10000
> byte at 0x81003ffb (0x0) != byte at 0x810010fb (0xff)
> Total of 4091 byte(s) were the same
>
>
> Erase: not able to do with a single command, need to issue for every 0x10000
> bytes.
>
> Write: Need to disable latch after every write to make it properly work.
>
> Is it possible for you to give me basic commands which you might have ran
> to confirm
> the read/write and erase ??
I tested the same part - for me i couldn't see the issues with SL256S
OK! can enable the log on poll function, spi_flash_cmd_wait_ready()
make debug -> printf.
Do the same test.! and send the log file.
--
Thanks,
Jagan.
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