accessing flash on the Ronzi A3

Ignacio García Pérez iggarpe at gmail.com
Tue Aug 16 08:20:01 EDT 2011


Can't help you much here, but I've been lately looking for a cheap JZ4760
based platform for testing and development, so learning about the existence
of this device is great news for me.

Does anyone know of other JZ4760 devices I should consider?

Rgds.

2011/8/5 Uli Raich <Uli.Raich at cern.ch>

>  Hi all,****
>
> I am trying to get usbboot to work on a Ronzi A3 which uses the JZ4760. The
> flash is of type 29f32G08 (Micron), a 4 GByte flash.****
>
> I start usbboot and run the “boot” command. During the initialization
> procedure for the flash I print the GPIO and NEMC register values:****
>
> MEMC_SMCR1:   0x0D44400****
>
> NEMC_SACR1:     0x00001AFE****
>
> NEMC_NFCSR:     0x00000003****
>
> GPIO_PAFUN:     0x002C00FF****
>
> GPIO_PADIR:       0x00000000****
>
> GPIO_PAPE:         0x003C00FF****
>
> ** **
>
> This looks all ok to me. Am I wrong?****
>
> Then I send a CMD_STATUS to the flash command register (0xBA400000).****
>
> After ~ 500ms delay I read back from the flash data port (0xBA000000) and
> all I read is 0xFF.****
>
> This indicates that the flash does not respond. Since the Ronzi A3 normally
> boots from this flash I used CS1 as chip select.****
>
> Does anybody have an idea what I am doing wrong or is there any example
> code around, where I could check?****
>
> Does anybody have the newest usbboot source code for Windows? ****
>
> For the moment I am stuck and any help would be largely appreciated.****
>
> Uli****
>
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