From 0a85a9e70593a9cd90fbbbdaad8443e31a9dd5a3 Mon Sep 17 00:00:00 2001 From: Liu Gang Date: Thu, 8 Mar 2012 00:33:20 +0000 Subject: powerpc/corenet_ds: Slave reads ENV from master when boot from SRIO When boot from SRIO, slave's ENV can be stored in master's memory space, then slave can fetch the ENV through SRIO interface. NOTE: Because the slave can not erase, write master's NOR flash by SRIO interface, so it can not modify the ENV parameters stored in master's NOR flash using "saveenv" or other commands. Master needs to: 1. Put the slave's ENV into it's own memory space. 2. Set an inbound SRIO window covered slave's ENV stored in master's memory space. Slave needs to: 1. Set a specific TLB entry in order to fetch ucode and ENV from master. 2. Set a LAW entry with the TargetID SRIO1 or SRIO2 for ucode and ENV. Signed-off-by: Liu Gang Signed-off-by: Shaohui Xie --- arch/powerpc/cpu/mpc8xxx/srio.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'arch') diff --git a/arch/powerpc/cpu/mpc8xxx/srio.c b/arch/powerpc/cpu/mpc8xxx/srio.c index e593f22..5694561 100644 --- a/arch/powerpc/cpu/mpc8xxx/srio.c +++ b/arch/powerpc/cpu/mpc8xxx/srio.c @@ -150,5 +150,22 @@ void srio_boot_master(void) .port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[2].riwar, SRIO_IB_ATMU_AR | atmu_size_mask(CONFIG_SRIOBOOT_SLAVE_UCODE_SIZE)); + + /* configure inbound window for slave's ENV */ + debug("SRIOBOOT - MASTER: Inbound window for slave's ENV; " + "Local = 0x%llx, Siro = 0x%llx, Size = 0x%x\n", + CONFIG_SRIOBOOT_SLAVE_ENV_LAW_PHYS, + CONFIG_SRIOBOOT_SLAVE_ENV_SRIO_PHYS, + CONFIG_SRIOBOOT_SLAVE_ENV_SIZE); + out_be32((void *)&srio->atmu + .port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[3].riwtar, + CONFIG_SRIOBOOT_SLAVE_ENV_LAW_PHYS >> 12); + out_be32((void *)&srio->atmu + .port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[3].riwbar, + CONFIG_SRIOBOOT_SLAVE_ENV_SRIO_PHYS >> 12); + out_be32((void *)&srio->atmu + .port[CONFIG_SRIOBOOT_MASTER_PORT].inbw[3].riwar, + SRIO_IB_ATMU_AR + | atmu_size_mask(CONFIG_SRIOBOOT_SLAVE_ENV_SIZE)); } #endif -- cgit v1.1