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xilinx: board: Update the kaslr-seed property

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Create a ft_board_setup() api that gets called as part
of bootm/booti before jumping to kernel. In this
ft_board_setup() callback that will inspect the DTB
and insert the device tree blob with the "kaslr-seed" property.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@amd.com>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20240117032014.1014084-2-venkatesh.abbarapu@amd.com
This commit is contained in:
Venkatesh Yadav Abbarapu 2024-01-17 08:50:13 +05:30 • committed by Michal Simek
parent ef67a04e7e
commit a270099e83
1 changed files with 49 additions and 0 deletions
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49
board/xilinx/common/board.c
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@ -25,6 +25,7 @@
#include <i2c_eeprom.h>
#include <net.h>
#include <generated/dt.h>
#include <rng.h>
#include <slre.h>
#include <soc.h>
#include <linux/ctype.h>
@ -682,3 +683,51 @@ phys_addr_t board_get_usable_ram_top(phys_size_t total_size)
return reg + size;
}
#endif
#ifdef CONFIG_OF_BOARD_SETUP
#define MAX_RAND_SIZE 8
int ft_board_setup(void *blob, struct bd_info *bd)
{
size_t n = MAX_RAND_SIZE;
struct udevice *dev;
u8 buf[MAX_RAND_SIZE];
int nodeoffset, ret;
if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
debug("No RNG device\n");
return 0;
}
if (dm_rng_read(dev, buf, n)) {
debug("Reading RNG failed\n");
return 0;
}
if (!blob) {
debug("No FDT memory address configured. Please configure\n"
"the FDT address via \"fdt addr <address>\" command.\n"
"Aborting!\n");
return 0;
}
ret = fdt_check_header(blob);
if (ret < 0) {
debug("fdt_chosen: %s\n", fdt_strerror(ret));
return ret;
}
nodeoffset = fdt_find_or_add_subnode(blob, 0, "chosen");
if (nodeoffset < 0) {
debug("Reading chosen node failed\n");
return nodeoffset;
}
ret = fdt_setprop(blob, nodeoffset, "kaslr-seed", buf, sizeof(buf));
if (ret < 0) {
debug("Unable to set kaslr-seed on chosen node: %s\n", fdt_strerror(ret));
return ret;
}
return 0;
}
#endif