Porting u-boot on v2 RAM256M+S-Flash16M.

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原创最新推荐文章于 2026-07-08 21:17:03 发布 1.1k 阅读 AI 写同款· GEO 优化 ›

深入研究移植u-boot. 从并行flash移植到串行flash(winbond 25Q64BVF1C(G)?)http://www.winbond.com.tw/NR/rdonlyres/591A37FF-007C-4E99-956C-F7EE4A6D9A8F/0/W25Q64BV.pdfhttp://www.spansion.com/Support/Datasheets/S25FL129P_00_06_e.pdfenv_relocate_spec()的定义处有: # line filename / context / l 阅读详情

chdrv_config_params.c中的宏定义要改为16M的.

board_init_r()中对BROI ROM的配置寄存器设置代码,改为16M flash.

flash_init()是cfi_flash.c中的,被注释掉了,直接改为设定为8Mflash.肯定需要改,要用sf_probe()?.

182 init_fnc_t *init_sequence[] = {
183     board_early_init_f,
184     timer_init,
185     env_init,       /* initialize environment */
186 #ifdef CONFIG_INCA_IP
187     incaip_set_cpuclk, /* set cpu clock according to environment variable */
188 #endif
189     init_baudrate,      /* initialze baudrate settings */
190     serial_init,        /* serial communications setup */
191     console_init_f,
192     display_banner,     /* say that we are here */
193     checkboard,
194     init_func_ram,
195     NULL,
196 };

in lowlevel_init.S, modify the alternate register to fit s-flash.

/* Alternate0 set USB, UART0 */
REGWR t0 0x0028 0x20780

order:

in start.S,

lowlevel_init

board_init_f

relocate_code:

in_ram:

board_init_r

emma3slx.h set up the SDRAM size

121 //#define CONFIG_SYS_SDRAM_SIZE     (128 << 20)
122 #define CONFIG_SYS_SDRAM_SIZE       (256 << 20)
123
124 #define CONFIG_SYS_UBOOT_SDRAM_SIZE 0x10000000
125 //#define CONFIG_SYS_UBOOT_SDRAM_SIZE        0x8000000

v2 p-flash的ddr initialization没有改成256M,也跑起来了?

how to use the flash driver to write the s-flash of 16M? confused.

CHDRV_FLASH_Erase()都是相对于handle指定的块的offset.

write_serial_flash() write one sector.

erase_serial_flash() erase 4kb sector.

板子坏了?换块16M的板子?

找一个loader试试能启动不?

change one write project, it is ok.

/* set the Network setup for ref board */

459     {
460 #define emmaZPIO_ZPIO_DIR2     *((ulong *)0xb0110d38)
461 #define emmaZPIO_ZPIO_DATA2    *((ulong *)0xb0110d08)
462 #define emmaZPIO_ZPIO_INT_ST2 *((ulong *)0xb0110d50)
463 #define emmaZPIO_ZPIO_MASK2    *((ulong *)0xb0110d68)
464 #define ZPIO_PIN_SET_BIT       0x00000200
465
466         /* net */
467         /* gpio enable */
468         emmaZPIO_ZPIO_INT_ST2 &= ~ZPIO_PIN_SET_BIT;
469         emmaZPIO_ZPIO_MASK2 &= ~ZPIO_PIN_SET_BIT;
470         /* set dir */
471         emmaZPIO_ZPIO_DIR2 |= ZPIO_PIN_SET_BIT;
472         /* low */
473         emmaZPIO_ZPIO_DATA2 &= ~ZPIO_PIN_SET_BIT;
474
475         sleep_seconds(0xffffffff);
476         sleep_seconds(0xffffffff);
477         /* high */
478         emmaZPIO_ZPIO_DATA2 |= ZPIO_PIN_SET_BIT;
479         sleep_seconds(0xffffffff);
480         sleep_seconds(0xffffffff);
481
482     }