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sunxi: spl: Detect at runtime where SPL was read from

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Make possible using a single `u-boot-sunxi-with-spl.bin` binary for both NAND
memory and SD card. Detection where SPL was read from is implemented in
`spl_boot_device`.

Signed-off-by: Daniel Kochmański <dkochmanski@turtle-solutions.eu>
CC: Roy Spliet <r.spliet@ultimaker.com>
Cc: Ian Campbell <ijc@hellion.org.uk>
[hdegoede@redhat.com: Some small coding style fixes]
Acked-by: Hans De Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Daniel Kochmański 2015-05-29 16:55:42 +02:00 committed by Hans de Goede
parent 645c48f50e
commit a151403fd2
1 changed files with 40 additions and 12 deletions
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52
arch/arm/cpu/armv7/sunxi/board.c
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@ -11,6 +11,7 @@
*/
#include <common.h>
#include <mmc.h>
#include <i2c.h>
#include <serial.h>
#ifdef CONFIG_SPL_BUILD
@ -22,6 +23,7 @@
#include <asm/arch/gpio.h>
#include <asm/arch/sys_proto.h>
#include <asm/arch/timer.h>
#include <asm/arch/mmc.h>
#include <linux/compiler.h>
@ -121,17 +123,18 @@ void s_init(void)
}
#ifdef CONFIG_SPL_BUILD
DECLARE_GLOBAL_DATA_PTR;
/* The sunxi internal brom will try to loader external bootloader
* from mmc0, nand flash, mmc2.
* Unfortunately we can't check how SPL was loaded so assume
* it's always the first SD/MMC controller
*/
u32 spl_boot_device(void)
{
struct mmc *mmc0, *mmc1;
/*
* When booting from the SD card, the "eGON.BT0" signature is expected
* to be found in memory at the address 0x0004 (see the "mksunxiboot"
* tool, which generates this header).
* When booting from the SD card or NAND memory, the "eGON.BT0"
* signature is expected to be found in memory at the address 0x0004
* (see the "mksunxiboot" tool, which generates this header).
*
* When booting in the FEL mode over USB, this signature is patched in
* memory and replaced with something else by the 'fel' tool. This other
@ -139,15 +142,40 @@ u32 spl_boot_device(void)
* valid bootable SD card image (because the BROM would refuse to
* execute the SPL in this case).
*
* This branch is just making a decision at runtime whether to load
* the main u-boot binary from the SD card (if the "eGON.BT0" signature
* is found) or return to the FEL code in the BROM to wait and receive
* the main u-boot binary over USB.
* This checks for the signature and if it is not found returns to
* the FEL code in the BROM to wait and receive the main u-boot
* binary over USB. If it is found, it determines where SPL was
* read from.
*/
if (readl(4) == 0x4E4F4765 && readl(8) == 0x3054422E) /* eGON.BT0 */
return BOOT_DEVICE_MMC1;
else
if (readl(4) != 0x4E4F4765 || readl(8) != 0x3054422E) /* eGON.BT0 */
return BOOT_DEVICE_BOARD;
/* The BROM will try to boot from mmc0 first, so try that first. */
mmc_initialize(gd->bd);
mmc0 = find_mmc_device(0);
if (sunxi_mmc_has_egon_boot_signature(mmc0))
return BOOT_DEVICE_MMC1;
/* Fallback to booting NAND if enabled. */
if (IS_ENABLED(CONFIG_SPL_NAND_SUPPORT))
return BOOT_DEVICE_NAND;
if (CONFIG_MMC_SUNXI_SLOT_EXTRA == 2) {
mmc1 = find_mmc_device(1);
if (sunxi_mmc_has_egon_boot_signature(mmc1)) {
/*
* spl_mmc.c: spl_mmc_load_image() is hard-coded to
* use find_mmc_device(0), no matter what we
* return. Swap mmc0 and mmc2 to make this work.
*/
mmc0->block_dev.dev = 1;
mmc1->block_dev.dev = 0;
return BOOT_DEVICE_MMC2;
}
}
panic("Could not determine boot source\n");
return -1; /* Never reached */
}
/* No confirmation data available in SPL yet. Hardcode bootmode */