From 272199765412182f82ff789eaeffb2d93d70a01e Mon Sep 17 00:00:00 2001 From: =?utf8?q?Pali=20Roh=C3=A1r?= Date: Fri, 9 Sep 2022 17:32:44 +0200 Subject: [PATCH] ddr: fsl: Allow to detect 4 GB DDR modules in 32-bit mode MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit U-Boot core code already handles the case when RAM size is bigger than CONFIG_MAX_MEM_MAPPED. So there is no need to do duplicate check in fsl ddr driver for CONFIG_MAX_MEM_MAPPED. Instead simplify code to just check if RAM size can be representable in phys_size_t type. And avoid printing warning if phys_size_t is just 1 byte smaller than RAM size, which is the typical situation with 4 GB DDR module. Signed-off-by: Pali Rohár --- drivers/ddr/fsl/main.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/ddr/fsl/main.c b/drivers/ddr/fsl/main.c index d44f16cdba..ed3313a531 100644 --- a/drivers/ddr/fsl/main.c +++ b/drivers/ddr/fsl/main.c @@ -857,15 +857,18 @@ phys_size_t __fsl_ddr_sdram(fsl_ddr_info_t *pinfo) debug("total_memory by %s = %llu\n", __func__, total_memory); #if !defined(CONFIG_PHYS_64BIT) - /* Check for more than max memory. Bad. */ - if ((first_ctrl == 0) && (total_memory > CONFIG_MAX_MEM_MAPPED)) { + /* + * Show warning about big DDR moodules. But avoid warning for 4 GB DDR + * modules when U-Boot supports RAM of maximal size 4 GB - 1 byte. + */ + if ((first_ctrl == 0) && (total_memory - 1 > (phys_size_t)~0ULL)) { puts("Detected "); print_size(total_memory, " of memory\n"); #ifndef CONFIG_SPL_BUILD puts(" "); /* re-align to match init_dram print */ #endif puts("This U-Boot only supports <= "); - print_size(CONFIG_MAX_MEM_MAPPED, " of DDR\n"); + print_size((unsigned long long)((phys_size_t)~0ULL)+1, " of DDR\n"); #ifndef CONFIG_SPL_BUILD puts(" "); /* re-align to match init_dram print */ #endif @@ -873,10 +876,13 @@ phys_size_t __fsl_ddr_sdram(fsl_ddr_info_t *pinfo) #ifndef CONFIG_SPL_BUILD puts(" "); /* re-align to match init_dram print */ #endif - total_memory = CONFIG_MAX_MEM_MAPPED; } #endif + /* Ensure that total_memory does not overflow on return */ + if (total_memory > (phys_size_t)~0ULL) + total_memory = (phys_size_t)~0ULL; + return total_memory; } -- 2.39.5