Hi Uli Raich hope this file can give your some idea: https://github.com/xiangfu/u-boot/blob/nanonote-jz4760-jz4740/nand_spl/nand_boot_jz4760.c
On 08/05/2011 08:16 PM, Uli Raich wrote:
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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