Boot P1020WLAN by SD (SDHC)

[arashaz_]

Hello,

Since there is no DIP switch on the P1020WLAN Rev. D  board, we appreciate to know how the board can be boot by a SD card (SDHC). Note that we have done all the steps mentioned in the document called Booting from On-Chip ROM (eSDHC or eSPI) for P1020 family and we have the SD card ready . But, it seems we need to change cfg_rom_loc[0:3], which seems impractical on this board. Thank you for your comments.

[paulgan · Accepted solution]

Hi Arashaz,

The default support boot mode is NOR flash on P1020WLAN. There is no DIP switch to change boot mode to SD boot.

But there is a workaround to rework the board to support SD. Change cfg_rom_loc[0:3]=0111. Only populate R108.

Below figure show the layout location for R108.

[arashaz_]

Thank you Fulian.

[yipingwang]

There are two mandatory changes to be done in hardware to boot from sdcard from P1020Wlan board.
1. Populating R108 on Cfg_rom_loc[0] pin.
2. unpopulating R89 from cfg_sdhc_cd_pol_sel.

[marius_grigoras]

Hi Arashaz,

Take a look in PORBMSR register (in ROM_LOC field more exactly) to see which is right now the default rom_location set it up now by the FPGA code (having no DIP SW on the board is pretty sure that the cfg_rom_loc is driven by FPGA).

You can't use PMUXCR register from software (this is fully focus on soc level muxing, not for POR stuff which are read-only).

Basically, you have 2 options:

1. use the flash/boot method suggested by cfg_rom_loc from PORBMSR........or

2. update the FPGA to use your specific cfg_rom_loc (I'm not familiar with FGPA code -- maybe a hardware guy can help on this side).

Regards,

Marius

[arashaz_]

Hello,

Thank you very much Marius. It was very useful.

Just to note that I found a set of 4 DIP switches called SW2 on the P102WLAN board, but it seems they are not related. I tested all possibilities and there was no change in the boot process.

Just to make sure, by FPGA, do you mean the CPLD code?

Regards,

Arash

[marius_grigoras]

Hi Arash,

Yes, FGPA means CPLD code.

Regards,

Marius