diff options
Diffstat (limited to 'arch/arm/mach-imx/imx25.c')
| -rw-r--r-- | arch/arm/mach-imx/imx25.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/arch/arm/mach-imx/imx25.c b/arch/arm/mach-imx/imx25.c index 8761d63682..3cfeebbe93 100644 --- a/arch/arm/mach-imx/imx25.c +++ b/arch/arm/mach-imx/imx25.c @@ -20,6 +20,9 @@ #include <mach/generic.h> #include <linux/sizes.h> +#define MX25_BOOTROM_HAB_MAGIC 0x3c95cac6 +#define MX25_DRYICE_GPR 0x3c + void imx25_setup_weimcs(size_t cs, unsigned upper, unsigned lower, unsigned additional) { @@ -55,9 +58,32 @@ u64 imx_uid(void) int imx25_init(void) { + int val; + imx25_boot_save_loc((void *)MX25_CCM_BASE_ADDR); add_generic_device("imx25-esdctl", 0, NULL, MX25_ESDCTL_BASE_ADDR, 0x1000, IORESOURCE_MEM, NULL); + /* + * When the i.MX25 is used with internal boot, the boot ROM always + * performs some HAB actions. These will copy the value from DryIce + * GPR (0x53ffc03c) to a location in SRAM (0x78001734) and then overwrites + * the GPR with 0x3c95cac6. + * After the HAB routine is done, the boot ROM should copy the previously + * saved value from SRAM back to the GPR. The last step is not done. + * The boot ROM is officially broken in this regard. + * This renders the Non-volatile memory to a Non-Non-volatile memory. + * To still be able to use the GPR for its intended purpose, copy the + * saved SRAM value back manually. + */ + val = readl(MX25_IRAM_BASE_ADDR + 0x1734); + + /* + * When there is a different value in SRAM than the magic value + * it must be a value saved to the GPR. + */ + if (val != MX25_BOOTROM_HAB_MAGIC) + writel(val, MX25_DRYICE_BASE_ADDR + MX25_DRYICE_GPR); + return 0; } |