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microblaze: Setup initrd_high and fdt_high at run time

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Setup initrd_high and fdt_high to be placed in lowmem space for kernel to
be able to reach it. Values are setup at run time to ensure that the same
setting can be used on different memory setup. Do this setting only when
variables are not

Similar run time detection was done for Zynqmp and Versal.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Michal Simek 2019-09-25 11:00:17 +02:00
parent 8272f31036
commit e0418347f9
2 changed files with 27 additions and 0 deletions
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8
arch/microblaze/Kconfig
View File

@ -20,6 +20,14 @@ config TARGET_MICROBLAZE_GENERIC
endchoice
config STACK_SIZE
hex "Define max stack size that can be used by u-boot"
default 0x200000
help
Defines Max stack size that can be used by u-boot so that the
initrd_high will be calculated as base stack pointer minus this
stack size.
source "board/xilinx/microblaze-generic/Kconfig"
config SPL_LDSCRIPT

19
board/xilinx/microblaze-generic/microblaze-generic.c
View File

@ -21,6 +21,7 @@
#include <asm/gpio.h>
#include <dm/uclass.h>
#include <wdt.h>
#include <linux/sizes.h>
DECLARE_GLOBAL_DATA_PTR;
@ -39,6 +40,8 @@ int dram_init(void)
int board_late_init(void)
{
ulong max_size, lowmem_size;
#if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_SYSRESET_MICROBLAZE)
int ret;
@ -47,5 +50,21 @@ int board_late_init(void)
if (ret)
printf("Warning: No reset driver: ret=%d\n", ret);
#endif
if (!(gd->flags & GD_FLG_ENV_DEFAULT)) {
debug("Saved variables - Skipping\n");
return 0;
}
max_size = gd->start_addr_sp - CONFIG_STACK_SIZE;
max_size = round_down(max_size, SZ_16M);
/* Linux default LOWMEM_SIZE is 0x30000000 = 768MB */
lowmem_size = gd->ram_base + 768 * 1024 * 1024;
env_set_addr("initrd_high", (void *)min_t(ulong, max_size,
lowmem_size));
env_set_addr("fdt_high", (void *)min_t(ulong, max_size, lowmem_size));
return 0;
}