From: Geert Uytterhoeven <geert+renesas@glider.be> To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/2] ARM: shmobile: kzm9g: Declare the full 512 MiB of RAM Date: Tue, 06 Jan 2015 19:17:37 +0000 [thread overview] Message-ID: <1420571859-11655-1-git-send-email-geert+renesas@glider.be> (raw) Hi Simon, Magnus, This patch series prepares kzm9g and kzm9g-reference dts for booting a multi-platform kernel. Traditionally, the first 16 MiB of RAM was reserved for the RT processor. However, this is incompatible with CONFIG_AUTO_ZRELADDR=y, which requires that the start address of physical memory is a multiple of 128 MiB. As CONFIG_AUTO_ZRELADDR=y is enabled for multi-platform kernels, declare RAM to start at 0x40000000. While at it, reclaim the last 8 MiB of RAM, too, so the full 512 MiB is available. We don't know the exact reason why the last 8 MiB of RAM was reserved, but thanks to Simon we know it is not used for a U-Boot splash screen. Note that kzm9g_defconfig still has CONFIG_MEMORY_START=0x41000000 and CONFIG_MEMORY_SIZE=0x1f000000, so before the advent of DT we scribbled over the last 8 MiB, too. This is an alternative solution for "[PATCH v2 01/05] ARM: shmobile: kzm9g-reference: 0x48008000 load address" (http://www.spinics.net/lists/linux-sh/msg38385.html), which (a) doesn't loose 112 MiB of RAM, and (b) doesn't force to switch from zImage to uImage. Thanks for applying! Geert Uytterhoeven (2): ARM: shmobile: kzm9g dts: Declare the full 512 MiB of RAM ARM: shmobile: kzm9g-reference dts: Declare the full 512 MiB of RAM arch/arm/boot/dts/sh73a0-kzm9g-reference.dts | 2 +- arch/arm/boot/dts/sh73a0-kzm9g.dts | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) -- 1.9.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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From: geert+renesas@glider.be (Geert Uytterhoeven) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 0/2] ARM: shmobile: kzm9g: Declare the full 512 MiB of RAM Date: Tue, 6 Jan 2015 20:17:37 +0100 [thread overview] Message-ID: <1420571859-11655-1-git-send-email-geert+renesas@glider.be> (raw) Hi Simon, Magnus, This patch series prepares kzm9g and kzm9g-reference dts for booting a multi-platform kernel. Traditionally, the first 16 MiB of RAM was reserved for the RT processor. However, this is incompatible with CONFIG_AUTO_ZRELADDR=y, which requires that the start address of physical memory is a multiple of 128 MiB. As CONFIG_AUTO_ZRELADDR=y is enabled for multi-platform kernels, declare RAM to start at 0x40000000. While at it, reclaim the last 8 MiB of RAM, too, so the full 512 MiB is available. We don't know the exact reason why the last 8 MiB of RAM was reserved, but thanks to Simon we know it is not used for a U-Boot splash screen. Note that kzm9g_defconfig still has CONFIG_MEMORY_START=0x41000000 and CONFIG_MEMORY_SIZE=0x1f000000, so before the advent of DT we scribbled over the last 8 MiB, too. This is an alternative solution for "[PATCH v2 01/05] ARM: shmobile: kzm9g-reference: 0x48008000 load address" (http://www.spinics.net/lists/linux-sh/msg38385.html), which (a) doesn't loose 112 MiB of RAM, and (b) doesn't force to switch from zImage to uImage. Thanks for applying! Geert Uytterhoeven (2): ARM: shmobile: kzm9g dts: Declare the full 512 MiB of RAM ARM: shmobile: kzm9g-reference dts: Declare the full 512 MiB of RAM arch/arm/boot/dts/sh73a0-kzm9g-reference.dts | 2 +- arch/arm/boot/dts/sh73a0-kzm9g.dts | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) -- 1.9.1 Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert at linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
next reply other threads:[~2015-01-06 19:17 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2015-01-06 19:17 Geert Uytterhoeven [this message] 2015-01-06 19:17 ` [PATCH v2 0/2] ARM: shmobile: kzm9g: Declare the full 512 MiB of RAM Geert Uytterhoeven 2015-01-06 19:17 ` [PATCH v2 1/2] ARM: shmobile: kzm9g dts: " Geert Uytterhoeven 2015-01-06 19:17 ` Geert Uytterhoeven 2015-01-06 19:17 ` [PATCH v2 2/2] ARM: shmobile: kzm9g-reference " Geert Uytterhoeven 2015-01-06 19:17 ` Geert Uytterhoeven 2015-01-08 0:14 ` [PATCH v2 0/2] ARM: shmobile: kzm9g: " Simon Horman 2015-01-08 0:14 ` Simon Horman 2015-01-22 2:51 ` Simon Horman 2015-01-22 2:51 ` Simon Horman 2015-01-23 4:22 ` Simon Horman 2015-01-23 4:22 ` Simon Horman 2015-01-23 9:55 ` Geert Uytterhoeven 2015-01-23 9:55 ` Geert Uytterhoeven
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