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riscv: ae250: Support DT provided by the board at runtime

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Enable CONFIG_OF_BOAD to support delivery dtb to u-boot
at run time instead of embedded.

There are two methods to delivery dtb.
 1 Pass from loader:
   When u-boot boot from RAM, gdb or loader can pass dtb
   via a2 to u-boot dynamically. Of course gdb or loader
   shall be in charge of dtb delivery.

 2 Configure CONFIG_SYS_FDT_BASE:
   It can be configured as RAM or ROM base statically,
   no mater u-boot boot from RAM or ROM.
   If it was configured as ROM base, dtb can be burned
   into ROM(spi flash) by spi driver.

Meanwhile remove CONFIG_SKIP_LOWLEVEL_INIT which is
useless in nx25-ae250 configuration.

Signed-off-by: Rick Chen <rick@andestech.com>
Signed-off-by: Rick Chen <rickchen36@gmail.com>
Cc: Greentime Hu <green.hu@gmail.com>
This commit is contained in:
Rick Chen 2018-03-29 10:08:33 +08:00 committed by Andes
parent 2bc5bea9e1
commit d58717e425
4 changed files with 15 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/riscv/cpu/nx25/start.S
View File

@ -45,6 +45,8 @@ trap_vector:
.global trap_entry
handle_reset:
li t0, CONFIG_SYS_SDRAM_BASE
SREG a2, 0(t0)
la t0, trap_entry
csrw mtvec, t0
csrwi mstatus, 0

9
board/AndesTech/nx25-ae250/nx25-ae250.c
View File

@ -64,3 +64,12 @@ ulong board_flash_get_legacy(ulong base, int banknum, flash_info_t *info)
{
return 0;
}
void *board_fdt_blob_setup(void)
{
void **ptr = (void *)CONFIG_SYS_SDRAM_BASE;
if (fdt_magic(*ptr) == FDT_MAGIC)
return (void *)*ptr;
return (void *)CONFIG_SYS_FDT_BASE;
}

1
configs/nx25-ae250_defconfig
View File

@ -16,6 +16,7 @@ CONFIG_CMD_CACHE=y
CONFIG_CMD_EXT2=y
CONFIG_CMD_FAT=y
CONFIG_OF_CONTROL=y
CONFIG_OF_BOARD=y
CONFIG_ENV_IS_IN_SPI_FLASH=y
CONFIG_NET_RANDOM_ETHADDR=y
CONFIG_DM=y

12
include/configs/nx25-ae250.h
View File

@ -11,18 +11,9 @@
/*
* CPU and Board Configuration Options
*/
#define CONFIG_SKIP_LOWLEVEL_INIT
#define CONFIG_BOOTP_SEND_HOSTNAME
#define CONFIG_BOOTP_SERVERIP
#ifdef CONFIG_SKIP_LOWLEVEL_INIT
#ifdef CONFIG_OF_CONTROL
#undef CONFIG_OF_SEPARATE
#define CONFIG_OF_EMBED
#endif
#endif
/*
* Miscellaneous configurable options
*/
@ -50,6 +41,9 @@
*/
#define CONFIG_SYS_MALLOC_LEN (512 << 10)
/* DT blob (fdt) address */
#define CONFIG_SYS_FDT_BASE 0x000f0000
/*
* Physical Memory Map
*/