MPC823E SMC/I2C/SPI micropatch

Jan Damborsky jan.damborsky at
Mon Jan 26 20:25:49 EST 2004

I think I have selected the __correct__ one.
Situated in ./arch/ppc/8xx_io/micropatch_850.c file.
- relocates I2C, SPI, SMC parameter RAM.
- it is determined for 850 and 823E processors (I hope).
- I had to define USE_SMC_PATCH and write some
   additional code for relocating SMC parameter RWM
   in cpm_load_patch() function (./arch/ppc/8xx_io/micropatch.c)
   as well as in SMC UART code (./arch/ppc/8xx_io/uart.c).
More additional hacks needed:
* original RPBASE set to 0x400 clashed with SMC micropatch
   so I redefined it to 0x800
* when used ethernets on SCC2,SCC3 with CONFIG_ENET_BIG_BUFFERS
   enabled, they need 2kB of DPRAM - it cannot fit together with
   micropatch in first 4kB of DPRAM, so I redefined
   CPM_DATAONLY_BASE to 0x1000 and CPM_DATAONLY_SIZE to 0x0c00

And for now, I have SCC2,SCC3 ethernets
and SMC1,SMC2 UARTs working altogether.

                               Sincerely, Jan Damborsky

Wolfgang Denk wrote:
> In message <4014C088.1020208 at> you wrote:
>>I have found out that CPM micropatch
>>available in linux-2.4 from Wolfgang Denk
>>site (the kernel we use successfuly on our
>>custom boards at present) is applicable as well.
> You have to select the _correct_ uCode patch.
> There is one patch for the MPC850, and another one for all other  8xx
> processors. And there is the USB SOF potch for the MPC823.
> Best regards,
> Wolfgang Denk
> --
> See us @ Embedded World, Nuremberg, Feb 17 - 19,  Hall 12.0 Booth 440
> Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at
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> 	-- Kirk, "This side of Paradise", stardate 3417.3

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