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board: samsung: e850-96: Add bootdev var to choose boot device

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Provide a way for the user to select which storage to load the LDFW
firmware from, by setting the corresponding environment variables:
  - bootdev: block device interface name
  - bootdevnum: block device number
  - bootdevpart: partition number

This might be useful when the OS is flashed and booted from a different
storage device than eMMC (e.g. USB flash drive). In this case it should
be sufficient to just set:

    => setenv bootdev usb
    => env save

assuming that the USB drive layout follows the same partitioning scheme
as defined in $partitions.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Sam Protsenko
2025-08-06 17:27:07 -05:00
committed by Minkyu Kang
parent c542140d7c
commit 75f75832d0
1 changed files with 29 additions and 9 deletions
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38
board/samsung/e850-96/e850-96.c
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@@ -9,6 +9,7 @@
#include <init.h>
#include <mapmem.h>
#include <net.h>
#include <usb.h>
#include <asm/io.h>
#include "fw.h"
#include "pmic.h"
@@ -136,21 +137,40 @@ static void setup_ethaddr(void)
eth_env_set_enetaddr("ethaddr", mac_addr);
}
int board_late_init(void)
/*
* Call this in board_late_init() to avoid probing block devices before
* efi_init_early().
*/
void load_firmware(void)
{
const char *ifname;
ulong dev, part;
int err;
setup_serial();
setup_ethaddr();
ifname = env_get("bootdev");
if (!ifname)
ifname = EMMC_IFNAME;
dev = env_get_ulong("bootdevnum", 10, EMMC_DEV_NUM);
part = env_get_ulong("bootdevpart", 10, EMMC_ESP_PART);
/*
* Do this in board_late_init() to make sure MMC is not probed before
* efi_init_early().
*/
err = load_ldfw(EMMC_IFNAME, EMMC_DEV_NUM, EMMC_ESP_PART,
LDFW_NWD_ADDR);
if (!strcmp(ifname, "usb")) {
printf("Starting USB (bootdev=usb)...\n");
err = usb_init();
if (err)
return;
}
printf("Loading LDFW firmware (from %s %ld)...\n", ifname, dev);
err = load_ldfw(ifname, dev, part, LDFW_NWD_ADDR);
if (err)
printf("ERROR: LDFW loading failed (%d)\n", err);
}
int board_late_init(void)
{
setup_serial();
setup_ethaddr();
load_firmware();
return 0;
}