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SubjectRe: [PATCH 2/3] mtd: rawnand: stm32_fmc2: add STM32 FMC2 NAND flash controller driver
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Hi Miquèl,

On 09/23/2018 01:34 PM, Miquel Raynal wrote:
> Hi Christophe,
>
> <christophe.kerello@st.com> wrote on Mon, 17 Sep 2018 17:47:39 +0200:
>
>> From: Christophe Kerello <christophe.kerello@st.com>
>>
>> The driver adds the support for the STMicroelectronics FMC2 NAND
>> Controller found on STM32MP SOCs.
>>
>> This patch is based on FMC2 command sequencer.
>> The purpose of the command sequencer is to facilitate the programming
>> and the reading of NAND flash pages with the ECC and to free the CPU
>> of sequencing tasks.
>> It requires one DMA channel for write and two DMA channels for read
>> operations.
>>
>> Only NAND_ECC_HW mode is actually supported.
>> The driver supports a maximum 8k page size.
>> The following ECC strength and step size are currently supported:
>> - nand-ecc-strength = <8>, nand-ecc-step-size = <512> (BCH8)
>> - nand-ecc-strength = <4>, nand-ecc-step-size = <512> (BCH4)
>> - nand-ecc-strength = <1>, nand-ecc-step-size = <512> (Extended ecc
>> based on HAMMING)
>>
>> This patch has been tested on Micron MT29F8G08ABACAH4 and
>> MT29F8G16ABACAH4
>>
>> Signed-off-by: Christophe Kerello <christophe.kerello@st.com>
>> ---
>
>
> [...]
>
>> +/* NAND callbacks setup */
>> +static void stm32_fmc2_nand_callbacks_setup(struct stm32_fmc2 *fmc2)
>> +{
>> + struct nand_chip *chip = &fmc2->chip;
>> +
>> + /* Specific callbacks to read/write a page */
>> + chip->ecc.correct = stm32_fmc2_ham_correct;
>> + chip->ecc.write_page = stm32_fmc2_sequencer_write_page;
>> + chip->ecc.read_page = stm32_fmc2_sequencer_read_page;
>> + chip->ecc.write_page_raw = stm32_fmc2_sequencer_write_page_raw;
>> + chip->ecc.read_page_raw = stm32_fmc2_sequencer_read_page_raw;
>
> Are you sure all the tests in mtd-utils are successful?

I am not sure to understand the question, so i have ran some of them:
mtd_nandbiterrs.ko, mtd_speedtest.ko and mtd_oobtest.ko on a 2 MBytes
partition.

# insmod mtd_nandbiterrs.ko dev=1
[ 235.062876]
[ 235.062904] ==================================================
[ 235.068747] mtd_nandbiterrs: MTD device: 1
[ 235.072904] mtd_nandbiterrs: MTD device size 2097152,
eraseblock=262144, page=4096, oob=224
[ 235.081177] mtd_nandbiterrs: Device uses 1 subpages of 4096 bytes
[ 235.087284] mtd_nandbiterrs: Using page=0, offset=0, eraseblock=0
[ 235.094109] mtd_nandbiterrs: incremental biterrors test
[ 235.098778] mtd_nandbiterrs: write_page
[ 235.103126] mtd_nandbiterrs: rewrite page
[ 235.106793] mtd_nandbiterrs: read_page
[ 235.110501] mtd_nandbiterrs: verify_page
[ 235.114406] mtd_nandbiterrs: Successfully corrected 0 bit errors per
subpage
[ 235.121124] mtd_nandbiterrs: Inserted biterror @ 0/5
[ 235.126117] mtd_nandbiterrs: rewrite page
[ 235.130490] mtd_nandbiterrs: read_page
[ 235.134247] mtd_nandbiterrs: Read reported 1 corrected bit errors
[ 235.139923] mtd_nandbiterrs: verify_page
[ 235.144124] mtd_nandbiterrs: Successfully corrected 1 bit errors per
subpage
[ 235.150891] mtd_nandbiterrs: Inserted biterror @ 0/2
[ 235.155888] mtd_nandbiterrs: rewrite page
[ 235.160244] mtd_nandbiterrs: read_page
[ 235.164001] mtd_nandbiterrs: Read reported 2 corrected bit errors
[ 235.169687] mtd_nandbiterrs: verify_page
[ 235.173881] mtd_nandbiterrs: Successfully corrected 2 bit errors per
subpage
[ 235.180653] mtd_nandbiterrs: Inserted biterror @ 0/0
[ 235.185631] mtd_nandbiterrs: rewrite page
[ 235.190052] mtd_nandbiterrs: read_page
[ 235.193743] mtd_nandbiterrs: Read reported 3 corrected bit errors
[ 235.199449] mtd_nandbiterrs: verify_page
[ 235.203631] mtd_nandbiterrs: Successfully corrected 3 bit errors per
subpage
[ 235.210415] mtd_nandbiterrs: Inserted biterror @ 1/7
[ 235.215391] mtd_nandbiterrs: rewrite page
[ 235.219760] mtd_nandbiterrs: read_page
[ 235.223507] mtd_nandbiterrs: Read reported 4 corrected bit errors
[ 235.229210] mtd_nandbiterrs: verify_page
[ 235.233392] mtd_nandbiterrs: Successfully corrected 4 bit errors per
subpage
[ 235.240175] mtd_nandbiterrs: Inserted biterror @ 1/5
[ 235.245149] mtd_nandbiterrs: rewrite page
[ 235.249516] mtd_nandbiterrs: read_page
[ 235.253272] mtd_nandbiterrs: Read reported 5 corrected bit errors
[ 235.258968] mtd_nandbiterrs: verify_page
[ 235.263151] mtd_nandbiterrs: Successfully corrected 5 bit errors per
subpage
[ 235.269933] mtd_nandbiterrs: Inserted biterror @ 1/2
[ 235.274923] mtd_nandbiterrs: rewrite page
[ 235.279272] mtd_nandbiterrs: read_page
[ 235.283021] mtd_nandbiterrs: Read reported 6 corrected bit errors
[ 235.288727] mtd_nandbiterrs: verify_page
[ 235.292910] mtd_nandbiterrs: Successfully corrected 6 bit errors per
subpage
[ 235.299694] mtd_nandbiterrs: Inserted biterror @ 1/0
[ 235.304671] mtd_nandbiterrs: rewrite page
[ 235.309028] mtd_nandbiterrs: read_page
[ 235.312780] mtd_nandbiterrs: Read reported 7 corrected bit errors
[ 235.318489] mtd_nandbiterrs: verify_page
[ 235.322673] mtd_nandbiterrs: Successfully corrected 7 bit errors per
subpage
[ 235.329457] mtd_nandbiterrs: Inserted biterror @ 2/6
[ 235.334432] mtd_nandbiterrs: rewrite page
[ 235.338796] mtd_nandbiterrs: read_page
[ 235.342526] mtd_nandbiterrs: Read reported 8 corrected bit errors
[ 235.348254] mtd_nandbiterrs: verify_page
[ 235.352441] mtd_nandbiterrs: Successfully corrected 8 bit errors per
subpage
[ 235.359223] mtd_nandbiterrs: Inserted biterror @ 2/5
[ 235.364197] mtd_nandbiterrs: rewrite page
[ 235.368565] mtd_nandbiterrs: read_page
[ 235.372283] mtd_nandbiterrs: error: read failed at 0x0
[ 235.377087] mtd_nandbiterrs: After 9 biterrors per subpage, read
reported error -74
[ 235.386307] mtd_nandbiterrs: finished successfully.
[ 235.389711] ==================================================

# insmod mtd_speedtest.ko dev=1
[ 256.862822]
[ 256.862850] =================================================
[ 256.868608] mtd_speedtest: MTD device: 1
[ 256.872562] mtd_speedtest: MTD device size 2097152, eraseblock size
262144, page size 4096, count of eraseblocks 8, pages per eraseblock 64,
OOB size 224
[ 256.889840] mtd_test: scanning for bad eraseblocks
[ 256.893233] mtd_test: scanned 8 eraseblocks, 0 are bad
[ 256.904002] mtd_speedtest: testing eraseblock write speed
[ 257.133918] mtd_speedtest: eraseblock write speed is 9102 KiB/s
[ 257.138376] mtd_speedtest: testing eraseblock read speed
[ 257.308241] mtd_speedtest: eraseblock read speed is 12487 KiB/s
[ 257.332093] mtd_speedtest: testing page write speed
[ 257.563379] mtd_speedtest: page write speed is 9022 KiB/s
[ 257.567314] mtd_speedtest: testing page read speed
[ 257.737934] mtd_speedtest: page read speed is 12412 KiB/s
[ 257.761272] mtd_speedtest: testing 2 page write speed
[ 257.991708] mtd_speedtest: 2 page write speed is 9061 KiB/s
[ 257.995830] mtd_speedtest: testing 2 page read speed
[ 258.165996] mtd_speedtest: 2 page read speed is 12412 KiB/s
[ 258.170102] mtd_speedtest: Testing erase speed
[ 258.193952] mtd_speedtest: erase speed is 107789 KiB/s
[ 258.197620] mtd_speedtest: Testing 2x multi-block erase speed
[ 258.209026] mtd_speedtest: 2x multi-block erase speed is 409600 KiB/s
[ 258.214010] mtd_speedtest: Testing 4x multi-block erase speed
[ 258.225402] mtd_speedtest: 4x multi-block erase speed is 409600 KiB/s
[ 258.230374] mtd_speedtest: Testing 8x multi-block erase speed
[ 258.241771] mtd_speedtest: 8x multi-block erase speed is 409600 KiB/s
[ 258.246757] mtd_speedtest: Testing 16x multi-block erase speed
[ 258.258227] mtd_speedtest: 16x multi-block erase speed is 409600 KiB/s
[ 258.263297] mtd_speedtest: Testing 32x multi-block erase speed
[ 258.274767] mtd_speedtest: 32x multi-block erase speed is 409600 KiB/s
[ 258.279826] mtd_speedtest: Testing 64x multi-block erase speed
[ 258.291307] mtd_speedtest: 64x multi-block erase speed is 409600 KiB/s
[ 258.296384] mtd_speedtest: finished
[ 258.299857] =================================================

# insmod mtd_oobtest.ko dev=1 bitflip_limit=2
[ 993.770824]
[ 993.770853] =================================================
[ 993.776689] mtd_oobtest: MTD device: 1
[ 993.780348] mtd_oobtest: MTD device size 2097152, eraseblock size
262144, page size 4096, count of eraseblocks 8, pages per eraseblock 64,
OOB size 224
[ 993.793977] mtd_test: scanning for bad eraseblocks
[ 993.798716] mtd_test: scanned 8 eraseblocks, 0 are bad
[ 993.803855] mtd_oobtest: test 1 of 5
[ 993.813081] mtd_oobtest: writing OOBs of whole device
[ 993.830940] mtd_oobtest: written up to eraseblock 0
[ 993.934094] mtd_oobtest: written 8 eraseblocks
[ 993.937080] mtd_oobtest: verifying all eraseblocks
[ 993.944908] mtd_oobtest: verified up to eraseblock 0
[ 993.969427] mtd_oobtest: verified 8 eraseblocks
[ 993.972499] mtd_oobtest: test 2 of 5
[ 993.985613] mtd_oobtest: writing OOBs of whole device
[ 994.003509] mtd_oobtest: written up to eraseblock 0
[ 994.106738] mtd_oobtest: written 8 eraseblocks
[ 994.109712] mtd_oobtest: verifying all eraseblocks
[ 994.117442] mtd_oobtest: verified up to eraseblock 0
[ 994.141342] mtd_oobtest: verified 8 eraseblocks
[ 994.144421] mtd_oobtest: test 3 of 5
[ 994.160526] mtd_oobtest: writing OOBs of whole device
[ 994.178486] mtd_oobtest: written up to eraseblock 0
[ 994.279164] mtd_oobtest: written 8 eraseblocks
[ 994.282136] mtd_oobtest: verifying all eraseblocks
[ 994.292790] mtd_oobtest: verified up to eraseblock 0
[ 994.337322] mtd_oobtest: verified 8 eraseblocks
[ 994.340379] mtd_oobtest: test 4 of 5
[ 994.355692] mtd_oobtest: attempting to start write past end of OOB
[ 994.360406] mtd_oobtest: an error is expected...
[ 994.365036] mtd_oobtest: error occurred as expected
[ 994.369895] mtd_oobtest: attempting to start read past end of OOB
[ 994.376005] mtd_oobtest: an error is expected...
[ 994.380604] mtd_oobtest: error occurred as expected
[ 994.385494] mtd_oobtest: attempting to write past end of device
[ 994.391398] mtd_oobtest: an error is expected...
[ 994.396027] mtd_oobtest: error occurred as expected
[ 994.400888] mtd_oobtest: attempting to read past end of device
[ 994.406752] mtd_oobtest: an error is expected...
[ 994.411335] mtd_oobtest: error occurred as expected
[ 994.416936] mtd_oobtest: attempting to write past end of device
[ 994.422127] mtd_oobtest: an error is expected...
[ 994.426757] mtd_oobtest: error occurred as expected
[ 994.431616] mtd_oobtest: attempting to read past end of device
[ 994.437461] mtd_oobtest: an error is expected...
[ 994.442061] mtd_oobtest: error occurred as expected
[ 994.446948] mtd_oobtest: test 5 of 5
[ 994.456172] mtd_oobtest: writing OOBs of whole device
[ 994.459991] mtd_oobtest: written up to eraseblock 0
[ 994.464842] mtd_oobtest: written up to eraseblock 0
[ 994.472018] mtd_oobtest: written 7 eraseblocks
[ 994.475007] mtd_oobtest: verifying all eraseblocks
[ 994.479878] mtd_oobtest: verified up to eraseblock 0
[ 994.485314] mtd_oobtest: verified 7 eraseblocks
[ 994.489267] mtd_oobtest: finished with 0 errors
[ 994.493828] =================================================

>
>
> Thanks,
> Miquèl
>

Thanks,
Christophe Kerello.

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