From cc15df57b1ce2fb7b9aac7567b25e7b3bef28458 Mon Sep 17 00:00:00 2001 From: Timur Tabi Date: Wed, 16 Nov 2011 13:28:34 -0600 Subject: [PATCH] powerpc/85xx: verify the localbus device tree address before booting the OS The localbus controller node in the device tree is typically a root node, even though the controller is part of CCSR. If we were to put the lbc node under the SOC node, then the 'ranges' property in the lbc node would translate through the 'ranges' property of the parent SOC node, and we don't want that. Since the lbc is a separate node, it's possible for the 'reg' property to be wrong. This happened with the original version of p1022ds.dts, which used a 32-bit value in the 'reg' address, instead of a 36-bit address. Signed-off-by: Timur Tabi Signed-off-by: Kumar Gala --- arch/powerpc/cpu/mpc85xx/fdt.c | 48 +++++++++++++++++++++++++++------- 1 file changed, 39 insertions(+), 9 deletions(-) diff --git a/arch/powerpc/cpu/mpc85xx/fdt.c b/arch/powerpc/cpu/mpc85xx/fdt.c index 62c7ea15d0..977770e99d 100644 --- a/arch/powerpc/cpu/mpc85xx/fdt.c +++ b/arch/powerpc/cpu/mpc85xx/fdt.c @@ -688,6 +688,12 @@ void ft_cpu_setup(void *blob, bd_t *bd) #define CCSR_VIRT_TO_PHYS(x) \ (CONFIG_SYS_CCSRBAR_PHYS + ((x) - CONFIG_SYS_CCSRBAR)) +static void msg(const char *name, uint64_t uaddr, uint64_t daddr) +{ + printf("Warning: U-Boot configured %s at address %llx,\n" + "but the device tree has it at %llx\n", name, uaddr, daddr); +} + /* * Verify the device tree * @@ -703,33 +709,32 @@ void ft_cpu_setup(void *blob, bd_t *bd) */ int ft_verify_fdt(void *fdt) { - uint64_t ccsr = 0; + uint64_t addr = 0; int aliases; int off; /* First check the CCSR base address */ off = fdt_node_offset_by_prop_value(fdt, -1, "device_type", "soc", 4); if (off > 0) - ccsr = fdt_get_base_address(fdt, off); + addr = fdt_get_base_address(fdt, off); - if (!ccsr) { + if (!addr) { printf("Warning: could not determine base CCSR address in " "device tree\n"); /* No point in checking anything else */ return 0; } - if (ccsr != CONFIG_SYS_CCSRBAR_PHYS) { - printf("Warning: U-Boot configured CCSR at address %llx,\n" - "but the device tree has it at %llx\n", - (uint64_t) CONFIG_SYS_CCSRBAR_PHYS, ccsr); + if (addr != CONFIG_SYS_CCSRBAR_PHYS) { + msg("CCSR", CONFIG_SYS_CCSRBAR_PHYS, addr); /* No point in checking anything else */ return 0; } /* - * Get the 'aliases' node. If there isn't one, then there's nothing - * left to do. + * Check some nodes via aliases. We assume that U-Boot and the device + * tree enumerate the devices equally. E.g. the first serial port in + * U-Boot is the same as "serial0" in the device tree. */ aliases = fdt_path_offset(fdt, "/aliases"); if (aliases > 0) { @@ -746,5 +751,30 @@ int ft_verify_fdt(void *fdt) #endif } + /* + * The localbus node is typically a root node, even though the lbc + * controller is part of CCSR. If we were to put the lbc node under + * the SOC node, then the 'ranges' property in the lbc node would + * translate through the 'ranges' property of the parent SOC node, and + * we don't want that. Since it's a separate node, it's possible for + * the 'reg' property to be wrong, so check it here. For now, we + * only check for "fsl,elbc" nodes. + */ +#ifdef CONFIG_SYS_LBC_ADDR + off = fdt_node_offset_by_compatible(fdt, -1, "fsl,elbc"); + if (off > 0) { + const u32 *reg = fdt_getprop(fdt, off, "reg", NULL); + if (reg) { + uint64_t uaddr = CCSR_VIRT_TO_PHYS(CONFIG_SYS_LBC_ADDR); + + addr = fdt_translate_address(fdt, off, reg); + if (uaddr != addr) { + msg("the localbus", uaddr, addr); + return 0; + } + } + } +#endif + return 1; }