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rockchip: rk3188: use boot0 hook to load up SPL in 2 steps

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For the RK3188, the BROM will attempt to load up the first stage
image (SPL for the RK3188) in two steps: first 1KB to offset 0x800
in the SRAM and then the remainder to offset 0xc00 in the SRAM.
It always enters at 0x804, though.

With this changeset, the RK3188 boot removes the TPL (stub) stage and
builds a single SPL binary that utilizes the early back-to-bootrom via
the boot0-hook.

Consequently, the passing of the saved boot params via pmu->os_reg[2]
is also removed.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Philipp Tomsich 2017-10-10 16:21:15 +02:00
parent ecfd71891a
commit 4d9253fb76
6 changed files with 9 additions and 112 deletions
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2
arch/arm/mach-rockchip/Kconfig
View file

@ -18,7 +18,7 @@ config ROCKCHIP_RK3188
select SUPPORT_SPL
select SUPPORT_TPL
select SPL
select TPL
select SPL_ROCKCHIP_EARLYRETURN_TO_BROM
select BOARD_LATE_INIT
select ROCKCHIP_BROM_HELPER
help

1
arch/arm/mach-rockchip/Makefile
View file

@ -11,7 +11,6 @@
obj-spl-$(CONFIG_ROCKCHIP_BROM_HELPER) += bootrom.o
obj-tpl-$(CONFIG_ROCKCHIP_BROM_HELPER) += bootrom.o
obj-tpl-$(CONFIG_ROCKCHIP_RK3188) += rk3188-board-tpl.o
obj-tpl-$(CONFIG_ROCKCHIP_RK3288) += rk3288-board-tpl.o
obj-tpl-$(CONFIG_ROCKCHIP_RK3368) += rk3368-board-tpl.o

10
arch/arm/mach-rockchip/rk3188-board-spl.c
View file

@ -101,7 +101,6 @@ static int setup_arm_clock(void)
void board_init_f(ulong dummy)
{
struct udevice *pinctrl, *dev;
struct rk3188_pmu *pmu;
int ret;
/* Example code showing how to enable the debug UART on RK3188 */
@ -145,15 +144,6 @@ void board_init_f(ulong dummy)
return;
}
/*
* Recover the bootrom's stackpointer.
* For whatever reason needs to run after rockchip_get_clk.
*/
pmu = syscon_get_first_range(ROCKCHIP_SYSCON_PMU);
if (IS_ERR(pmu))
pr_err("pmu syscon returned %ld\n", PTR_ERR(pmu));
SAVE_SP_ADDR = readl(&pmu->sys_reg[2]);
ret = uclass_get_device(UCLASS_PINCTRL, 0, &pinctrl);
if (ret) {
debug("Pinctrl init failed: %d\n", ret);

86
arch/arm/mach-rockchip/rk3188-board-tpl.c
View file

@ -1,86 +0,0 @@
/*
* (C) Copyright 2015 Google, Inc
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <debug_uart.h>
#include <spl.h>
#include <asm/io.h>
#include <asm/arch/bootrom.h>
#include <asm/arch/pmu_rk3188.h>
DECLARE_GLOBAL_DATA_PTR;
/* track how often we were entered */
static int rk3188_num_entries __attribute__ ((section(".data")));
#define PMU_BASE 0x20004000
#define SPL_ENTRY 0x10080C00
static void jump_to_spl(void)
{
typedef void __noreturn (*image_entry_noargs_t)(void);
struct rk3188_pmu * const pmu = (void *)PMU_BASE;
image_entry_noargs_t tpl_entry =
(image_entry_noargs_t)(unsigned long)SPL_ENTRY;
/* Store the SAVE_SP_ADDR in a location shared with SPL. */
writel(SAVE_SP_ADDR, &pmu->sys_reg[2]);
tpl_entry();
}
void board_init_f(ulong dummy)
{
/* Example code showing how to enable the debug UART on RK3188 */
#ifdef EARLY_UART
#include <asm/arch/grf_rk3188.h>
/* Enable early UART on the RK3188 */
#define GRF_BASE 0x20008000
struct rk3188_grf * const grf = (void *)GRF_BASE;
rk_clrsetreg(&grf->gpio1b_iomux,
GPIO1B1_MASK << GPIO1B1_SHIFT |
GPIO1B0_MASK << GPIO1B0_SHIFT,
GPIO1B1_UART2_SOUT << GPIO1B1_SHIFT |
GPIO1B0_UART2_SIN << GPIO1B0_SHIFT);
/*
* Debug UART can be used from here if required:
*
* debug_uart_init();
* printch('a');
* printhex8(0x1234);
* printascii("string");
*/
debug_uart_init();
printch('t');
printch('p');
printch('l');
printch('-');
printch(rk3188_num_entries + 1 + '0');
printch('\n');
#endif
rk3188_num_entries++;
if (rk3188_num_entries == 1) {
/*
* The original loader did some very basic integrity
* checking at this point, but the remaining few bytes
* could be used for any improvement making sense
* really early on.
*/
back_to_bootrom();
} else {
/*
* TPL part of the loader should now wait for us
* at offset 0xC00 in the sram. Should never return
* from there.
*/
jump_to_spl();
}
}

10
doc/README.rockchip
View file

@ -176,17 +176,17 @@ described above, but the image creation needs a bit more care.
The bootrom of rk3188 expects to find a small 1kb loader which returns
control to the bootrom, after which it will load the real loader, which
can then be up to 29kb in size and does the regular ddr init.
can then be up to 29kb in size and does the regular ddr init. This is
handled by a single image (built as the SPL stage) that tests whether
it is handled for the first or second time via code executed from the
boot0-hook.
Additionally the rk3188 requires everything the bootrom loads to be
rc4-encrypted. Except for the very first stage the bootrom always reads
and decodes 2kb pages, so files should be sized accordingly.
# copy tpl, pad to 1020 bytes and append spl
cat tpl/u-boot-tpl.bin > tplspl.bin
truncate -s 1020 tplspl.bin
cat spl/u-boot-spl.bin >> tplspl.bin
tools/mkimage -n rk3188 -T rksd -d tplspl.bin out
tools/mkimage -n rk3188 -T rksd -d spl/u-boot-spl.bin out
# truncate, encode and append u-boot.bin
truncate -s %2048 u-boot.bin

12
include/configs/rk3188_common.h
View file

@ -36,14 +36,9 @@
#define CONFIG_ROCKCHIP_MAX_INIT_SIZE (0x8000 - 0x800)
#define CONFIG_ROCKCHIP_CHIP_TAG "RK31"
#ifdef CONFIG_TPL_BUILD
#define CONFIG_SPL_TEXT_BASE 0x10080804
/* tpl size 1kb - 4byte RK31 header */
#define CONFIG_SPL_MAX_SIZE (0x400 - 0x4)
#elif defined(CONFIG_SPL_BUILD)
/* spl size 32kb sram - 2kb bootrom - 1kb spl */
#define CONFIG_SPL_MAX_SIZE (0x8000 - 0xC00)
#define CONFIG_SPL_TEXT_BASE 0x10080C00
#define CONFIG_SPL_TEXT_BASE 0x10080800
/* spl size 32kb sram - 2kb bootrom */
#define CONFIG_SPL_MAX_SIZE (0x8000 - 0x800)
#define CONFIG_SPL_FRAMEWORK 1
#define CONFIG_SPL_CLK 1
#define CONFIG_SPL_PINCTRL 1
@ -52,7 +47,6 @@
#define CONFIG_SPL_RAM 1
#define CONFIG_SPL_DRIVERS_MISC_SUPPORT 1
#define CONFIG_ROCKCHIP_SERIAL 1
#endif
#define CONFIG_SPL_STACK 0x10087fff