@@ -102,8 +102,9 @@ static uint8_t mxs_get_bootmode_index(void)
return i;
}
-void mxs_common_spl_init(const iomux_cfg_t *iomux_setup,
- const unsigned int iomux_size)
+void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
+ const iomux_cfg_t *iomux_setup,
+ const unsigned int iomux_size)
{
struct mxs_spl_data *data = (struct mxs_spl_data *)
((CONFIG_SYS_TEXT_BASE - sizeof(struct mxs_spl_data)) & ~0xf);
@@ -152,39 +152,49 @@ _reset:
/*
* Store all registers on old stack pointer, this will allow us later to
* return to the BootROM and let the BootROM load U-Boot into RAM.
+ *
+ * WARNING: Register r0 and r1 are used by the BootROM to pass data
+ * to the called code. Register r0 will contain arbitrary
+ * data that are set in the BootStream. In case this code
+ * was started with CALL instruction, register r1 will contain
+ * pointer to the return value this function can then set.
+ * The code below MUST NOT CHANGE register r0 and r1 !
*/
push {r0-r12,r14}
- /* save control register c1 */
- mrc p15, 0, r0, c1, c0, 0
- push {r0}
+ /* Save control register c1 */
+ mrc p15, 0, r2, c1, c0, 0
+ push {r2}
- /*
- * set the cpu to SVC32 mode and store old CPSR register content
- */
- mrs r0,cpsr
- push {r0}
- bic r0,r0,#0x1f
- orr r0,r0,#0xd3
- msr cpsr,r0
+ /* Set the cpu to SVC32 mode and store old CPSR register content. */
+ mrs r2, cpsr
+ push {r2}
+ bic r2, r2, #0x1f
+ orr r2, r2, #0xd3
+ msr cpsr, r2
bl board_init_ll
+ /* Restore BootROM's CPU mode (especially FIQ). */
+ pop {r2}
+ msr cpsr,r2
+
/*
- * restore bootrom's cpu mode (especially FIQ)
+ * Restore c1 register. Especially set exception vector location
+ * back to BootROM space which is required by bootrom for USB boot.
*/
- pop {r0}
- msr cpsr,r0
+ pop {r2}
+ mcr p15, 0, r2, c1, c0, 0
+
+ pop {r0-r12,r14}
/*
- * restore c1 register
- * (especially set exception vector location back to
- * bootrom space which is required by bootrom for USB boot)
+ * In case this code was started by the CALL instruction, the register
+ * r0 is examined by the BootROM after this code returns. The value in
+ * r0 must be set to 0 to indicate successful return.
*/
- pop {r0}
- mcr p15, 0, r0, c1, c0, 0
+ mov r0, #0
- pop {r0-r12,r14}
bx lr
_hang:
@@ -28,8 +28,9 @@ int mxsmmc_initialize(bd_t *bis, int id, int (*wp)(int), int (*cd)(int));
#include <asm/arch/iomux-mx28.h>
#endif
-void mxs_common_spl_init(const iomux_cfg_t *iomux_setup,
- const unsigned int iomux_size);
+void mxs_common_spl_init(const uint32_t arg, const uint32_t *resptr,
+ const iomux_cfg_t *iomux_setup,
+ const unsigned int iomux_size);
#endif
struct mxs_pair {
@@ -132,9 +132,9 @@ const iomux_cfg_t iomux_setup[] = {
MX28_PAD_EMI_CKE__EMI_CKE | MUX_CONFIG_EMI,
};
-void board_init_ll(void)
+void board_init_ll(const uint32_t arg, const uint32_t *resptr)
{
- mxs_common_spl_init(iomux_setup, ARRAY_SIZE(iomux_setup));
+ mxs_common_spl_init(arg, resptr, iomux_setup, ARRAY_SIZE(iomux_setup));
/* switch LED on */
gpio_direction_output(MX28_PAD_PWM3__GPIO_3_28, 0);
@@ -200,7 +200,7 @@ const iomux_cfg_t iomux_setup[] = {
(MXS_PAD_3V3 | MXS_PAD_8MA | MXS_PAD_PULLUP),
};
-void board_init_ll(void)
+void board_init_ll(const uint32_t arg, const uint32_t *resptr)
{
- mxs_common_spl_init(iomux_setup, ARRAY_SIZE(iomux_setup));
+ mxs_common_spl_init(arg, resptr, iomux_setup, ARRAY_SIZE(iomux_setup));
}
@@ -129,7 +129,7 @@ void mxs_adjust_memory_params(uint32_t *dram_vals)
dram_vals[HW_DRAM_CTL14] = HW_DRAM_CTL14_CONFIG;
}
-void board_init_ll(void)
+void board_init_ll(const uint32_t arg, const uint32_t *resptr)
{
- mxs_common_spl_init(iomux_setup, ARRAY_SIZE(iomux_setup));
+ mxs_common_spl_init(arg, resptr, iomux_setup, ARRAY_SIZE(iomux_setup));
}
@@ -200,7 +200,7 @@ void mxs_adjust_memory_params(uint32_t *dram_vals)
dram_vals[HW_DRAM_CTL29] = HW_DRAM_CTL29_CONFIG;
}
-void board_init_ll(void)
+void board_init_ll(const uint32_t arg, const uint32_t *resptr)
{
- mxs_common_spl_init(iomux_setup, ARRAY_SIZE(iomux_setup));
+ mxs_common_spl_init(arg, resptr, iomux_setup, ARRAY_SIZE(iomux_setup));
}
@@ -85,7 +85,7 @@ const iomux_cfg_t iomux_setup[] = {
(MXS_PAD_3V3 | MXS_PAD_12MA | MXS_PAD_NOPULL),
};
-void board_init_ll(void)
+void board_init_ll(const uint32_t arg, const uint32_t *resptr)
{
- mxs_common_spl_init(iomux_setup, ARRAY_SIZE(iomux_setup));
+ mxs_common_spl_init(arg, resptr, iomux_setup, ARRAY_SIZE(iomux_setup));
}
@@ -138,9 +138,9 @@ const iomux_cfg_t iomux_setup[] = {
MX28_PAD_GPMI_D06__GPIO_0_6 | MUX_CONFIG_LED,
};
-void board_init_ll(void)
+void board_init_ll(const uint32_t arg, const uint32_t *resptr)
{
- mxs_common_spl_init(iomux_setup, ARRAY_SIZE(iomux_setup));
+ mxs_common_spl_init(arg, resptr, iomux_setup, ARRAY_SIZE(iomux_setup));
}
void mxs_adjust_memory_params(uint32_t *dram_vals)
Make sure value in register r0 and r1 is preserved and passed to the board_init_ll() and mxs_common_spl_init() where it can be processed further. The value in r0 can be configured during the BootStream generation to arbitary value, r1 contains pointer to return value from CALL'd function. This patch also clears the value in r0 before returning to BootROM to make sure the BootROM is not confused by this value. Finally, this patch cleans up some comments in the start.S file. Signed-off-by: Marek Vasut <marex@denx.de> Cc: Fabio Estevam <fabio.estevam@freescale.com> Cc: Stefano Babic <sbabic@denx.de> --- arch/arm/cpu/arm926ejs/mxs/spl_boot.c | 5 +-- arch/arm/cpu/arm926ejs/mxs/start.S | 50 +++++++++++++++++------------ arch/arm/include/asm/arch-mxs/sys_proto.h | 5 +-- board/bluegiga/apx4devkit/spl_boot.c | 4 +-- board/denx/m28evk/spl_boot.c | 4 +-- board/freescale/mx23evk/spl_boot.c | 4 +-- board/freescale/mx28evk/iomux.c | 4 +-- board/olimex/mx23_olinuxino/spl_boot.c | 4 +-- board/schulercontrol/sc_sps_1/spl_boot.c | 4 +-- 9 files changed, 48 insertions(+), 36 deletions(-)