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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
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9
board/AndesTech/nx25-ae250/nx25-ae250.c
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@@ -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;
}