topic Re: mcf5441x, esdhc, BLKATTR question in ColdFire/68K Microcontrollers and Processors

mcf5441x, esdhc, BLKATTR question

angelo_d — Mon, 09 Sep 2019 08:41:51 GMT

Hi all,

working on a Linux driver for this module,

on CMD 18 (and other), from the upper layer, i am getting a value of 0x1200 (4608) for block size (BLKSZE field).

As a bit-width, this value can be applied, but wondering if it is legal, and what it can cause, since datasheet shows a maximum of 4096.

Thanks

Regards,

Angelo

Re: mcf5441x, esdhc, BLKATTR question

Hui_Ma — Wed, 11 Sep 2019 02:39:15 GMT

Hi Angelo,

Does this issue always happen?

Have you tried with different board? If another board still with the same issue?

Thanks for more detailed info.

Have a great day,
Mike

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Re: mcf5441x, esdhc, BLKATTR question

angelo_d — Mon, 04 Nov 2019 14:38:58 GMT

Hi Tom,

many thanks,

i reply so late since there is always something that delay my coldfire activity :smileysad:

Yes the same seems to be actually done by

host->sdma_boundary = 0;

I checked sdhci-of-esdhc.c and also tried to have working sdhci-esdhc-imx.c, it seems both are for esdhc but there are some issues with them,

- sdhci-of-esdhc.c is for devicetree (of) and m68k is still stuck on platform board.c, of course i can add platform support in it, but not sure it's welcome, then there was some other reasons i don't remember right now,

- coldfire controller has some oddities and different bitfields from imx, and it is actually resultied easier, and less risky, to issue a new < 200 lines mcf driver. I am trying this way, but of course community is able to block it. Until now, they seems to agree my approach.

Hopefully in few days i should be able to come back on this.

Thanks

Angelo