Q/OSPIFBlockDevice: fix misconception in minimum program size #13848

LDong-Arm · 2020-11-03T14:57:58Z

Summary of changes

Prior to this PR, the minimum program size (QSPI_MIN_PROG_SIZE) of QSPIFBlockDevice and OSPIFBlockDevice were 256 by default and 512 for some targets. Those values were in fact page sizes, not program/write sizes. Consequently the value returned by QSPIFBlockDevice::get_program_size() is the large page size, and taking out a whole page to just write a few bytes is highly inefficient.

Here's an explanation of the concepts:

Most flashes can be programmed to a granularity of 1-byte or 4-byte (1-word) - no need to be a whole page. (In fact the early version of QSPIFBlockDevice assumed 1-byte to be always supported.) This should be the value of QSPI_MIN_PROG_SIZE. Applications need to align buffer sizes to this granularity when programming QSPI flash.
Each sending of the underlying QSPI/OSPI program signal requires destination bytes to be located within the same page. If a ::program() call crosses page boundaries, the function breaks down the operation into multiple chunks, so it's not a concern for the application.

So this PR changes the default program size to 1 (byte), and overrides it to 4 for some targets.

Minimum program size/granularity for all supported QSPI/OSPI flash model (for targets with QSPIF in targets.json):

MX25R6435F: 1-byte, tested on DISCO_L475VG_IOT01A
MCU_NRF52840: 4-byte (one word), tested on NRF52840_DK
N25Q128A: 1-byte, tested on DISCO_F746NG
All MX25L*G series: 1-byte, see programming guide
MT25QL512: 1-byte, see datasheet

If the number of bytes sent to the device is less than the maximum page size, they are correctly programmed at the specified addresses without any effect on the other bytes of the same page.
MCU_PSOC6: 1-byte - it can be inferred from the fact that Cy_SMIF_MemWrite() handles any number of bytes (incl. bytes not aligned to pages or anything) ~~@ARMmbed/team-cypress Could you confirm this is the write size of the flash?~~ Update: Tested by @kyle-cypress
EFM32GG11_STK3701: 4-byte, as its qspi_write() enforces word-size access (note: its read size is also 4-byte as per existing configuration) @ARMmbed/team-silabs Could you confirm this is the write size of the flash?
MCU_LPC546XX: 4-byte, as its qspi_write() enforces word-sized access @ARMmbed/team-nxp Could you confirm this is the write size of the flash?
MX25LM51245G (OSPI): 1-byte, see section 2 of its datasheet.

Notes:

No config is needed for the page size, as it comes from the SFDP table parsed during initialisation.
~~The same issue may exist for OSPIFlashBlockDevice too, but I didn't change it without having a target to test.~~ Change made for OSPIFBlockDevice too.

Impact of changes

QSPIFBlockDevice::get_program_size() and OSPIFBlockDevice::get_program_size() return the correct value (1 or 4 normally) instead of the 256 or 512.

Migration actions required

None.

Documentation

None.

Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

Note: This change is tested by general_block_device.test_program_read_small_data_sizes - it programs 1-7 bytes using BufferedBlockDevice, which in turn uses the minimum program size of QSPIFBlockDevice to program (1 or 4 bytes).

Reviewers

@ARMmbed/mbed-os-core @VeijoPesonen @SeppoTakalo

LDong-Arm · 2020-11-03T15:21:12Z

~~Maybe the program granularity can be parsed from SFDP. Closing this PR until I've figured it out.~~
Update: It seems SFDP doesn't require write granularity to be smaller than one page...
From the SFDP specification (requires registration to view):

New system implementations should refer to 6.4.14 for the buffer (page) size. The legacy minimum write granularity is a single byte within any size programming buffer.

Not sure what to do about this. Maybe we do have to set the program size configuration in a chip-by-chip basis, but it's hard to check without having all the boards at hands. Or, keep the program size equal to the page size (as it is), which is the safest but far from optimal...

LDong-Arm · 2020-11-03T15:57:49Z

Reopening this PR for discussion.

ciarmcom · 2020-11-03T17:27:03Z

@LDong-Arm, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

LDong-Arm · 2020-11-04T11:49:52Z

This is ready for review. I've listed QSPI flash models and their program sizes based on existing materials, but haven't tried some of them on physical boards. Is it enough, or shall we ask silicon vendors to confirm them, or ask engineers with those boards to try them out?

storage/blockdevice/COMPONENT_QSPIF/mbed_lib.json

kyle-cypress · 2020-11-06T03:10:54Z

I ran the QSPI HAL, BlockDevice, and KVStore tests on CY8CKIT-062-WIFI-BT and CY8CPROTO-062-4343W.
On CY8CKIT-062-WIFI-BT all passed.
CY8CPROTO-062-4343W reported a failure in storage-blockdevice-tests-tests-blockdevice-general_block_device. The immediate cause is that "QSPIF Testing contiguous erase, write and read" is timing out:

[1604631936.81][CONN][INF] found KV pair in stream: {{__testcase_start;QSPIF Testing contiguous erase, write and read}}, queued...
[1604631936.85][CONN][RXD] Test Contiguous Erase/Program/Read Starts..
[1604631936.88][CONN][RXD] program_size=1
[1604631936.90][CONN][RXD] block_device->size()=67108864
[1604631936.92][CONN][RXD] start_address=0x7c0000
[1604631936.96][CONN][RXD] stop_address=0x840000
[1604631936.98][CONN][RXD] contiguous_erase_size=10
[1604631937.02][CONN][RXD] erasing memory, from 0x7c0000 of size 0x80000
<Lengthy wait, at least a minute>
[1604632068.82][CONN][RXD] erasing memory, from 0x7c0000 of size 0x80000
<another lengthy wait>
[1604632195.98][HTST][INF] test suite run finished after 300.92 sec...
[1604632195.99][CONN][INF] received special event '__host_test_finished' value='True', finishing
[1604632196.03][HTST][INF] CONN exited with code: 0
[1604632196.03][HTST][INF] No events in queue
[1604632196.03][HTST][INF] stopped consuming events
[1604632196.03][HTST][INF] host test result(): None
[1604632196.03][HTST][WRN] missing __exit event from DUT
[1604632196.04][HTST][WRN] missing __exit_event_queue event from host test
[1604632196.04][HTST][ERR] missing __exit_event_queue event from host test and no result from host test, timeout...
[1604632196.04][HTST][INF] calling blocking teardown()
[1604632196.04][HTST][INF] teardown() finished
[1604632196.04][HTST][INF] {{result;timeout}}

I'm not sure if this is a true failure in the sense of the test hanging, or if the smaller program size is just slowing down the test so much that it hits the timeout.

LDong-Arm · 2020-11-06T10:27:18Z

@kyle-cypress Thanks a lot for trying it out. I think it's highly possible the test is way too slow, because it now programs one by at a time on that target.
~~To improve this, the test should program in large chunks, as long as chunk size % program size is 0. I'll update the test and see if it works.~~

From your log,

[1604631936.92][CONN][RXD] start_address=0x7c0000
[1604631936.96][CONN][RXD] stop_address=0x840000

start_address and stop_address are two sectors apart, so it looks like flash has a huge 256KB sector size.

Did the test pass on that target, without this PR?

LDong-Arm · 2020-11-06T10:29:22Z

@pan- FYI, this is the PR I mentioned.

evedon · 2020-11-06T11:23:57Z

Notes:

The same issue may exist for OSPIFlashBlockDevice too, but I didn't change it without having a target to test.

Only DISCO_L4R9I in targets.json has support for OSPIF : https://github.com/ARMmbed/mbed-os/blob/master/targets/targets.json/#L3559

This target has 2 x OctoSPI memory interface. OSPI_MIN_PROG_SIZE is set to 256: https://github.com/ARMmbed/mbed-os/blob/master/storage/blockdevice/COMPONENT_OSPIF/mbed_lib.json/#L26
@ARMmbed/team-st-mcd Could you confirm this is the write size of the flash?

LDong-Arm · 2020-11-06T11:31:45Z

This target has 2 x OctoSPI memory interface. OSPI_MIN_PROG_SIZE is set to 256: https://github.com/ARMmbed/mbed-os/blob/master/storage/blockdevice/COMPONENT_OSPIF/mbed_lib.json/#L26
@ARMmbed/team-st-mcd Could you confirm this is the write size of the flash?

From the datasheet of the OctoSPI flash, section 2:

After program/erase command is issued, auto program/erase algorithms which program/erase and verify the
specified page or sector/block locations will be executed. Program command is executed on byte basis, or page (256
bytes) basis, or word basis. Erase command is executed on sector (4K-byte), or block (64K-byte), or whole chip
basis.

So I think the write size should be one byte (i.e. the minimum granularity that applications can program). I can do the change for OSPIFBlockDevice too, but then it'd be good if someone from @ARMmbed/team-st-mcd tries that on the target.

jeromecoutant · 2020-11-06T11:59:05Z

@rogeryou Maybe you could comment?

LDong-Arm · 2020-11-06T12:07:13Z

@rogeryou Maybe you could comment?

I've added the change to OSPIFBlockDevice, so an easy way to check is to give it a try

kyle-cypress · 2020-11-06T16:05:37Z

@LDong-Arm

From your log,

[1604631936.92][CONN][RXD] start_address=0x7c0000
[1604631936.96][CONN][RXD] stop_address=0x840000

start_address and stop_address are two sectors apart, so it looks like flash has a huge 256KB sector

Indeed - printed at the beginning of the test:

[1604678326.13][CONN][RXD] read size: 1bytes (1bytes)
[1604678326.16][CONN][RXD] program size: 1bytes (1bytes)
[1604678326.20][CONN][RXD] erase size: 256kbytes (262144bytes)
[1604678326.24][CONN][RXD] total size: 64Mbytes (67108864bytes)

Did the test pass on that target, without this PR?

Yes, after I saw the failure on the PR branch I checked out master and confirmed that the test passes there (in significantly less time)

[1604678649.00][CONN][RXD] Test Contiguous Erase/Program/Read Starts..
[1604678649.02][CONN][RXD] program_size=512
[1604678649.05][CONN][RXD] block_device->size()=67108864
[1604678649.07][CONN][RXD] start_address=0x7c0000
[1604678649.09][CONN][RXD] stop_address=0x840000
[1604678649.12][CONN][RXD] contiguous_erase_size=10
[1604678649.17][CONN][RXD] erasing memory, from 0x7c0000 of size 0x80000
[1604678652.08][CONN][RXD] erasing memory, from 0x7c0000 of size 0x80000
[1604678655.84][CONN][INF] found KV pair in stream: {{__testcase_finish;QSPIF Testing contiguous erase, write and read;1;0}}, queued...
[1604678655.91][CONN][RXD] >>> 'QSPIF Testing contiguous erase, write and read': 1 passed, 0 failed

LDong-Arm · 2020-11-06T17:02:36Z

@kyle-cypress I've just optimized test_contiguous_erase_write_read() to use 256-byte chunks for read/write if possible. This is way larger than the 8 * 1-byte chunks (which timed out), but less than the 8 * 256-byte chunks (without this PR) - I was trying to find a balance that looks "generic".

Could you fetch my last update and try the test again? Thanks.

LDong-Arm · 2020-11-06T17:10:33Z

storage/blockdevice/tests/TESTS/blockdevice/general_block_device/main.cpp

+    // (which should be a power of 2) is greater than that. If it's less than
+    // that, the test finishes quickly anyway...
+    if ((program_size < 256) && (256 % program_size == 0)
+        && (contiguous_erase_size >= 256) && (contiguous_erase_size % 256 == 0)) {


Checks of (256 % program_size == 0) and (contiguous_erase_size % 256 == 0) shouldn't be necessary (if the other two conditions are satisfied), because sector and program sizes are always powers of 2. We're just trying to be rigorous...

kyle-cypress · 2020-11-06T18:53:26Z

@kyle-cypress I've just optimized test_contiguous_erase_write_read() to use 256-byte chunks for read/write if possible. This is way larger than the 8 * 1-byte chunks (which timed out), but less than the 8 * 256-byte chunks (without this PR) - I was trying to find a balance that looks "generic".

Could you fetch my last update and try the test again? Thanks.

Thanks, that fixed the failure. Reran on CY8CKIT-062-WIFI-BT and confirmed things are still passing there as well.

evedon

Looks good.

0xc0170 · 2020-11-12T09:04:29Z

I've checked one log for disco, it contains a failure in DISCO_L475VG_IOT01A-ARMC6 | DISCO_L475VG_IOT01A | storage-kvstore-tests-tests-kvstore-general_tests_phase . Please review

Prior to this PR, the minimum program size (QSPI_MIN_PROG_SIZE) of QSPIFBlockDevice was 256 by default and 512 for some targets. Those values were in fact page sizes, not program sizes. Here's an explanation: * Most QSPI flashes can be programmed to a granularity of a single byte or a few bytes - no need to be a whole page. This should be the value of QSPI_MIN_PROG_SIZE. Applications need to align buffer sizes to this granularity when programming QSPI flashes. * Each sending of the underlying QSPI program signal requires destination bytes to be located within the same page. If a QSPIFBlockDevice::program() call crosses page boundaries, this function breaks down the operation into multiple chunks, so it's not a concern for the application. So this PR changes the default program size to 1 (byte), and for targets with a 4-byte (1-word) read size it overrides the program size. Note: No config is needed for the page size, as it comes from the SFDP table parsed during initialisation.

From the datasheet of the only OctaSPI flash we currently support (http://www.mt-system.ru/sites/default/files/docs/Macronix/mx25lm51245g_3v_512mb_v0.01.pdf): After program/erase command is issued, auto program/erase algorithms which program/erase and verify the specified page or sector/block locations will be executed. Program command is executed on byte basis, or page (256 bytes) basis, or word basis. Erase command is executed on sector (4K-byte), or block (64K-byte), or whole chip basis. So the minimum write size is one byte.

…fer size for large-sector flashes

Pull request has been modified.

LDong-Arm · 2020-11-12T16:44:00Z

I've checked one log for disco, it contains a failure in DISCO_L475VG_IOT01A-ARMC6 | DISCO_L475VG_IOT01A | storage-kvstore-tests-tests-kvstore-general_tests_phase . Please review

Thanks, I just fixed it in the last commit. What happened was, after we fixed the QSPIFBlockDevice's write size, the test doesn't allocate enough space for SecureStore to run set_add_data_set_key_value_five_Kbytes (which requires > 5KB). I added a minimum value to the calculation of required size.

…e enough The test case set_add_data_set_key_value_five_Kbytes stores 5KB of value, and to allow for overheads, we allocate at least 8KB per area of TDBStore (so 16KB for two areas of a whole TDBStore).

0xc0170 · 2020-11-17T15:12:29Z

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LDong-Arm closed this Nov 3, 2020

LDong-Arm reopened this Nov 3, 2020

ciarmcom added the release-type: patch Indentifies a PR as containing just a patch label Nov 3, 2020

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LDong-Arm changed the title ~~QSPIFBlockDevice: fix misconception in minimum program size~~ WIP: QSPIFBlockDevice: fix misconception in minimum program size Nov 3, 2020

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LDong-Arm force-pushed the qspif_program_size_fix branch from ff6e39d to bfae577 Compare November 4, 2020 10:27

LDong-Arm changed the title ~~WIP: QSPIFBlockDevice: fix misconception in minimum program size~~ QSPIFBlockDevice: fix misconception in minimum program size Nov 4, 2020

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LDong-Arm changed the title ~~QSPIFBlockDevice: fix misconception in minimum program size~~ Q/OSPIFBlockDevice: fix misconception in minimum program size Nov 6, 2020

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LDong-Arm force-pushed the qspif_program_size_fix branch from d7222fa to d26398b Compare November 6, 2020 17:22

evedon previously approved these changes Nov 9, 2020

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LDong-Arm added 4 commits November 12, 2020 14:36

Fix printing of contiguous_erase_size

9f3ada3

general_block_device: optimize test_contiguous_erase_write_read() buf…

76cf78d

…fer size for large-sector flashes

LDong-Arm force-pushed the qspif_program_size_fix branch from d26398b to 68a816c Compare November 12, 2020 16:40

LDong-Arm requested review from 0xc0170 and evedon November 12, 2020 16:44

general_tests_phase_2: SecureStore's underlying TDBStore must be larg…

13c5b64

…e enough The test case set_add_data_set_key_value_five_Kbytes stores 5KB of value, and to allow for overheads, we allocate at least 8KB per area of TDBStore (so 16KB for two areas of a whole TDBStore).

LDong-Arm force-pushed the qspif_program_size_fix branch from 68a816c to 13c5b64 Compare November 12, 2020 16:46

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LDong-Arm mentioned this pull request Nov 19, 2020

KVStore: kvstore-general_tests_phase_2 failing with underestimated storage size #12912

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mbedmain removed release-type: patch Indentifies a PR as containing just a patch Release-pending labels Nov 23, 2020

Q/OSPIFBlockDevice: fix misconception in minimum program size #13848

Q/OSPIFBlockDevice: fix misconception in minimum program size #13848

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