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[xbboot] make theh xbboot work with software usbboot mode

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This commit is contained in:
Xiangfu Liu 2010-04-14 15:35:21 +08:00
parent bf43104a6a
commit e7cf9e2297
1 changed files with 23 additions and 49 deletions
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72
xbboot/target-stage1/stage1.c
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@ -11,25 +11,6 @@
#include "../target-common/jz4740.h" #include "../target-common/jz4740.h"
#include "../target-common/serial.h" #include "../target-common/serial.h"
#define STAGE1_ARGS_ADDR 0x80002008
struct stage1_args {
// PLL
unsigned char ext_clk; // external crystal in MHz
unsigned char cpu_speed; // PLL output frequency=cpu_speed * ext_clk Mhz
unsigned char phm_div; // frequency divider ratio of PLL=CCLK:PCLK=HCLK=MCLK
// UART
unsigned char uart_num; // which UART to use (default: 0)
unsigned int uart_baud; // default: 57600
// SDRAM
unsigned char bus_width_16; // bus width of SDRAM is 16-bit (default is 32-bit)
unsigned char bank_addr_2bit; // 2-bit bank address width (=4 banks each chip select), default is 1-bit bank address=2 banks
unsigned char row_addr; // row address width in bits (11-13)
unsigned char col_addr; // column address width in bits (8-12)
} __attribute__((packed));
void load_args(); void load_args();
void gpio_init(); void gpio_init();
void pll_init(); void pll_init();
@ -50,40 +31,28 @@ void c_main(void)
} }
// tbd: do they have to be copied into globals? or just reference STAGE1_ARGS_ADDR? // tbd: do they have to be copied into globals? or just reference STAGE1_ARGS_ADDR?
volatile u32 ARG_EXTAL; static volatile u32 ARG_EXTAL;
volatile u32 ARG_CPU_SPEED; static volatile u32 ARG_CPU_SPEED;
volatile u8 ARG_PHM_DIV; static volatile u8 ARG_PHM_DIV;
volatile u32 ARG_UART_BASE; static volatile u32 ARG_UART_BASE;
volatile u32 ARG_UART_BAUD; static volatile u32 ARG_UART_BAUD;
volatile u8 ARG_BUS_WIDTH_16; static volatile u8 ARG_BUS_WIDTH_16;
volatile u8 ARG_BANK_ADDR_2BIT; static volatile u8 ARG_BANK_ADDR_2BIT;
volatile u8 ARG_ROW_ADDR; static volatile u8 ARG_ROW_ADDR;
volatile u8 ARG_COL_ADDR; static volatile u8 ARG_COL_ADDR;
void load_args() void load_args()
{ {
struct stage1_args* args = (struct stage1_args*) STAGE1_ARGS_ADDR; ARG_EXTAL = 12 * 1000000;
// NanoNote defaults ARG_CPU_SPEED = 21 * ARG_EXTAL;
args->ext_clk = 12; ARG_PHM_DIV = 3;
args->cpu_speed = 21; ARG_UART_BASE = UART0_BASE + 0 * UART_OFF;
args->phm_div = 3;
args->uart_num = 0;
args->uart_baud = 57600;
args->bus_width_16 = 1;
args->bank_addr_2bit = 1;
args->row_addr = 13;
args->col_addr = 9;
// END NanoNote defaults
ARG_EXTAL = args->ext_clk * 1000000;
ARG_CPU_SPEED = args->cpu_speed * ARG_EXTAL;
ARG_PHM_DIV = args->phm_div;
ARG_UART_BASE = UART0_BASE + args->uart_num * UART_OFF;
UART_BASE = ARG_UART_BASE; // for ../target-common/serial.c UART_BASE = ARG_UART_BASE; // for ../target-common/serial.c
ARG_UART_BAUD = args->uart_baud; ARG_UART_BAUD = 57600;
ARG_BUS_WIDTH_16 = args->bus_width_16; ARG_BUS_WIDTH_16 = * (int *)0x80002014;
ARG_BANK_ADDR_2BIT = args->bank_addr_2bit; ARG_BANK_ADDR_2BIT = 1;
ARG_ROW_ADDR = args->row_addr; ARG_ROW_ADDR = 13;
ARG_COL_ADDR = args->col_addr; ARG_COL_ADDR = 9;
} }
void gpio_init() void gpio_init()
@ -198,6 +167,11 @@ void sdram_init()
int div[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32}; int div[] = {1, 2, 3, 4, 6, 8, 12, 16, 24, 32};
if (ARG_BUS_WIDTH_16 == 0xff)
return;
else
ARG_BUS_WIDTH_16 = 1;
cpu_clk = ARG_CPU_SPEED; cpu_clk = ARG_CPU_SPEED;
mem_clk = cpu_clk * div[__cpm_get_cdiv()] / div[__cpm_get_mdiv()]; mem_clk = cpu_clk * div[__cpm_get_cdiv()] / div[__cpm_get_mdiv()];