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esmt: fix id code for F50D1G41LB" To: Miquel Raynal Cc: richard@nod.at, vigneshr@ti.com, tudor.ambarus@linaro.org, mmkurbanov@salutedevices.com, george.moussalem@outlook.com, linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org References: <87wm2x74pz.fsf@bootlin.com> From: Ziyang Huang In-Reply-To: <87wm2x74pz.fsf@bootlin.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: TY4PR01CA0019.jpnprd01.prod.outlook.com (2603:1096:405:2bf::9) To TYZPR01MB5556.apcprd01.prod.exchangelabs.com (2603:1096:400:363::9) X-Microsoft-Original-Message-ID: <8a8cb349-0362-4c47-9b6c-7a2e99eb18e9@outlook.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: TYZPR01MB5556:EE_|TY0PR01MB5443:EE_ X-MS-Office365-Filtering-Correlation-Id: 947c2134-022b-456a-39cc-08de398e3d01 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14:53:42.8718 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 84df9e7f-e9f6-40af-b435-aaaaaaaaaaaa X-MS-Exchange-CrossTenant-RMS-PersistedConsumerOrg: 00000000-0000-0000-0000-000000000000 X-MS-Exchange-Transport-CrossTenantHeadersStamped: TY0PR01MB5443 在 2025/12/8 16:33, Miquel Raynal 写道: > On 02/12/2025 at 23:05:56 +08, Ziyang Huang wrote: > >> This reverts commit dd26402642a0899fde59ea6b0852fad3d799b4cc. >> >> The issue George met is due to the limit of QPIC, not the issue of the >> flash chip. >> >> QPIC only supports 4 bytes ID. So the fifth byte is always 0. >> >> If we use spi-gpio, the fifth byte can be read correctly. >> >> Signed-off-by: Ziyang Huang >> --- > > So how do we solve that? > > Is there anything than can be done on the qpic side? > > Thanks, > Miquèl Unfortunately, There is not a good way to solve it now. In Openwrt, I made a hack to force the max compare bytes to 4. I'm trying to find a way to let QPIC do a raw SPI op. But without documents, it's hard. For router devices, an other typical way is to use parameter page. This feature is supported in almost all of the high-speed QSPI NANDs they used. But for now, 4 bytes is enough for the router devices since only a few flash models will be used. More the that, some vendor SDKs use 2 bytes.