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fix fsbl and opensbi serial ports print baud --form https://community.milkv.io/t/set-the-baud-rate-to-115200-before-uboot/959

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This commit is contained in:
yue-xiaomin
2023-12-24 15:13:30 +08:00
parent ab1c239a02
commit 3dad3aa6f0
2 changed files with 27 additions and 1 deletions
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26
fsbl/plat/cv180x/bl2/bl2_main.c
View File

@ -46,8 +46,34 @@ int dec_verify_image(const void *image, size_t size, size_t dec_skip, struct fip
} }
#endif #endif
// Start of addition
#define UART_DLL 0x04140000
#define UART_DLH 0x04140004
#define UART_LCR 0x0414000C
void set_baudrate()
{
// 14 for 115200, 13 for 128000
int baud_divisor = 14;
// set DLAB to 1 to set dll and dlh
*(volatile uint32_t*)(UART_LCR) |= (uint32_t)0x80;
// set divisor
*(volatile uint32_t*)(UART_DLL) = (uint32_t)(baud_divisor & 0xff);
*(volatile uint32_t*)(UART_DLH) = (uint32_t)((baud_divisor >> 8) & 0xff);
// set DLAB back to 0
*(volatile uint32_t*)(UART_LCR) &= (uint32_t)(~0x80);
}
// End of addition
void bl2_main(void) void bl2_main(void)
{ {
// Start of addition
set_baudrate();
// End of addition
ATF_STATE = ATF_STATE_BL2_MAIN; ATF_STATE = ATF_STATE_BL2_MAIN;
time_records->fsbl_start = read_time_ms(); time_records->fsbl_start = read_time_ms();

2
opensbi/lib/utils/serial/uart8250.c
View File

@ -101,7 +101,7 @@ int uart8250_init(unsigned long base, u32 in_freq, u32 baudrate, u32 reg_shift,
uart8250_in_freq = in_freq; uart8250_in_freq = in_freq;
uart8250_baudrate = baudrate; uart8250_baudrate = baudrate;
bdiv = uart8250_in_freq / (16 * uart8250_baudrate); bdiv = (uart8250_in_freq + 8 * uart8250_baudrate) / (16 * uart8250_baudrate);
/* Disable all interrupts */ /* Disable all interrupts */
set_reg(UART_IER_OFFSET, 0x00); set_reg(UART_IER_OFFSET, 0x00);