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| acathla | I have a new Lattice ice40up5k evn board and LiteX hangs during boot. I tried different CPU/git versions. With tag 2022.12, il boots, and hangs after "Initializing N25Q032A SPI Flash @0x00400000... Enabling Quad mode..." | 11:14 |
|---|---|---|
| acathla | It's a new flash MX25L3233F that is not yet available. And it's not wired to be available in 4x. I tried a different flash MX25L3235D, but it does the same. I'm not even sure the problem is with the flash... | 11:16 |
| tnt | Well is you soc configured to not use it in quad mode ? | 11:16 |
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| acathla | tnt, the platform does not include "spiflash4x" so I guessed it could not switch to 4x automatically | 12:18 |
| zyp | acathla, the check only checks if the module itself has a quad read command | 12:36 |
| zyp | https://github.com/enjoy-digital/litex/blob/master/litex/soc/software/liblitespi/spiflash.c#L115 | 12:36 |
| zyp | the define comes from here: https://github.com/enjoy-digital/litex/blob/master/litex/soc/integration/soc.py#L1776 | 12:37 |
| acathla | ah, there is a #define SPIFLASH_MODULE_QUAD_CAPABLE but it's defined by the flash module, not the platform :( | 12:37 |
| zyp | easiest way to disable it without patching litex is probably to provide a flash module description without the READ_1_1_4 command | 12:38 |
| acathla | I just found that. Is there a del_constant? | 12:38 |
| zyp | you could probably do something like «del soc.constants['SPIFLASH_MODULE_QUAD_CAPABLE']» | 12:39 |
| acathla | zyp, fake flash module works fine, thanks for the idea. del soc.constants does not work, or I put it at the wrong place. | 13:14 |
| acathla | if SpiNorFlashOpCodes.READ_1_1_4 in module.supported_opcodes and mode == "4x": | 13:16 |
| acathla | that fix in https://github.com/enjoy-digital/litex/blob/master/litex/soc/integration/soc.py#L1776 seems to work | 13:17 |
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| zyp | I'm also not entirely sure the quad enable bit is in the same place in every flash module, I suspect that code might actually only work for some particular modules | 13:40 |
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