[PATCH 02/10] imx: imx8qm/qxp: Fix issue in get_effective_memsize

Peng Fan peng.fan at nxp.com
Tue May 5 14:28:38 CEST 2020

From: Ye Li <ye.li at nxp.com>

When Trusty OS allocates the mem region from 0xfe0000000-0xffffffff,
the get_effective_memsize does not return correct memory size.
There is a check in get_effective_memsize to find the memreg where
the u-boot is running, and return the size of that memreg as the result
of get_effective_memsize. When using aligned start, the value is
0x80200000 since it is 2MB aligned. Thus the finding of memreg will
fail and return the PHYS_SDRAM_1_SIZE because u-boot text base is
0x80020000. This cause u-boot is relocated to the high memory where has
been occupied by Trusty OS.

Reviewed-by: Peng Fan <peng.fan at nxp.com>
Signed-off-by: Ye Li <ye.li at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
 arch/arm/mach-imx/imx8/cpu.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-imx/imx8/cpu.c b/arch/arm/mach-imx/imx8/cpu.c
index f87276e8ea..2c79bd0091 100644
--- a/arch/arm/mach-imx/imx8/cpu.c
+++ b/arch/arm/mach-imx/imx8/cpu.c
@@ -223,7 +223,7 @@ static int get_owned_memreg(sc_rm_mr_t mr, sc_faddr_t *addr_start,
 phys_size_t get_effective_memsize(void)
 	sc_rm_mr_t mr;
-	sc_faddr_t start, end, end1;
+	sc_faddr_t start, end, end1, start_aligned;
 	int err;
 	end1 = (sc_faddr_t)PHYS_SDRAM_1 + PHYS_SDRAM_1_SIZE;
@@ -231,9 +231,9 @@ phys_size_t get_effective_memsize(void)
 	for (mr = 0; mr < 64; mr++) {
 		err = get_owned_memreg(mr, &start, &end);
 		if (!err) {
-			start = roundup(start, MEMSTART_ALIGNMENT);
+			start_aligned = roundup(start, MEMSTART_ALIGNMENT);
 			/* Too small memory region, not use it */
-			if (start > end)
+			if (start_aligned > end)
 			/* Find the memory region runs the U-Boot */

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