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Spread Spectrum Enable in plug in with secure boot

Question asked by Asma Alekar on Jan 22, 2020
Latest reply on Jan 27, 2020 by Asma Alekar

Hello Everyone,


I am trying to enable Spread Spectrum in our board which is running uboot version: U-Boot 2018.03-00038-g34c3d6bfa9-dirty and kernel version: 4.19.35-04790-ga5119fdf76b3-dirty also I am using OPTEE revision 3.2 (062c5f78).


i have made following changes to enable SS:

1.Set CONFIG_USE_IMXIMG_PLUGIN=y in our defconfig

2. added plugin.s file as we did not use before(contents of plugin.s), following document enable the spread spectrum 

.macro imx6ul_ddr3_arm2_setting
ldr r0, =CCM_BASE_ADDR
ldr r1, [r0,#0x18]
ldr r3, [r0,#0x18]
/* set periph_clik2_sel to select OSC_CLK */
and r1, r1, #0xffffcfff
orr r1, r1, #0x00001000
str r1, [r0,#0x18]
/* set periph_clk_set to switch to OSC_CLK */
ldr r1, [r0,#0x14]
ldr r2, [r0,#0x14]
orr r1, r1, #0x02000000
str r1, [r0,#0x14]
/* power down PLL2 */
ldr r0, =0x020c8000
ldr r1, [r0,#0x30]
orr r1, r1, #0x00010000
str r1, [r0,#0x30]
/* enable spread spectrum & configure */
ldr r1, =0x00001770
str r1, [r0,#0x60]
ldr r1, =0x05dc8006
str r1, [r0,#0x40]

ldr r1, [r0,#0x30]
and r1, r1, #0xFFFEFFFF
str r1, [r0,#0x30]
/* need delay short time before switch PLL2 it back */
ldr r4, =0x0
add r4, r4, #0x1
cmp r4, #0x200000
bne pu_delay
/* recovery the previous PLL source setting */
ldr r0, =CCM_BASE_ADDR
str r2, [r0,#0x14]
str r3, [r0,#0x18]


macro imx6_ddr_setting
#if defined (CONFIG_TARGET_MX6UL)
#error "SOC not configured"


/* include the common plugin code here */
#include <asm/arch/mx6_plugin.S>


when I compile uboot its giving me following error:

AS board/freescale/mx6ul/plugin.o
arm-poky-linux-gnueabi-objcopy -O binary --gap-fill 0xff board/freescale/mx6ul/plugin.o board/freescale/mx6ul/plugin.bin
MKIMAGE u-boot-dtb.imx
Error: Header v2: SECURE_BOOT is only supported in DCD mode!arch/arm/mach-imx/Makefile:144: recipe for target 'u-boot-dtb.imx' failed
make[1]: *** [u-boot-dtb.imx] Error 1
Makefile:912: recipe for target 'u-boot-dtb.imx' failed
make: *** [u-boot-dtb.imx] Error 2
/home/asmas/imx-dev/cst-dev/sign/uboot-qt850 has invalid IVT (self)
cp: cannot stat '/home/asmas/imx-dev/cst-dev/sign/uboot-qt850.hab': No such file or directory


My question is:

1.Is it possible to use SECURE_BOOT and Spread spectrum plugin together?

2. If SECURE_BOOT and plug in cannot be used together, what is the other method to enable spread spectrum?


Thanks in advance for any help.