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author | Michael Sevakis <jethead71@rockbox.org> | 2010-05-08 07:45:34 +0000 |
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committer | Michael Sevakis <jethead71@rockbox.org> | 2010-05-08 07:45:34 +0000 |
commit | a420561bf8315f60c290ea41aaa7e80f410c592d (patch) | |
tree | 4f8f2e5e8ad8f613d3647a0239e8c40ed8b3cf8c /firmware/target/arm/imx31/crt0.S | |
parent | 7f3b3494a6a4198c59e07d54ad979b7a764250b6 (diff) | |
download | rockbox-a420561bf8315f60c290ea41aaa7e80f410c592d.tar.gz rockbox-a420561bf8315f60c290ea41aaa7e80f410c592d.zip |
Gigabeat S: Reclaim about 800K of memory that was laying unused. Get rid of DEVBSS_ATTR for this target and implement as NOCACHEBSS_ATTR. Plugin and codec buffers move so all that is now incompatible (do full update). No version increase for plugins/codecs because the loader will reject them.
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25895 a1c6a512-1295-4272-9138-f99709370657
Diffstat (limited to 'firmware/target/arm/imx31/crt0.S')
-rw-r--r-- | firmware/target/arm/imx31/crt0.S | 43 |
1 files changed, 18 insertions, 25 deletions
diff --git a/firmware/target/arm/imx31/crt0.S b/firmware/target/arm/imx31/crt0.S index 3a0a0041d4..979306e264 100644 --- a/firmware/target/arm/imx31/crt0.S +++ b/firmware/target/arm/imx31/crt0.S | |||
@@ -134,7 +134,8 @@ remap_start: | |||
134 | 134 | ||
135 | /* Set page tables */ | 135 | /* Set page tables */ |
136 | 136 | ||
137 | /* Map each memory loc to itself, no cache */ | 137 | /* Map each memory loc to itself |
138 | * not cached, not buffered */ | ||
138 | /* Physical address = 0x0 */ | 139 | /* Physical address = 0x0 */ |
139 | mov r1, #(1 << 10) /* superuser - r/w, user - no access */ | 140 | mov r1, #(1 << 10) /* superuser - r/w, user - no access */ |
140 | orr r1, r1, #((0 << 5) | /* domain 0th */ \ | 141 | orr r1, r1, #((0 << 5) | /* domain 0th */ \ |
@@ -148,27 +149,28 @@ remap_start: | |||
148 | cmp r2, r3 | 149 | cmp r2, r3 |
149 | blo 1b | 150 | blo 1b |
150 | 151 | ||
151 | bic r1, r1, #0x0ff00000 /* Back up */ | 152 | /* Bits 31:20 of r1 will be 0 due to wraparound in previous loop */ |
152 | 153 | ||
153 | /* Map 0x80000000 -> 0x0, cached */ | 154 | /* Map PA:0x80000000-0x83ffffff to VA:0x00000000-0x03f00000 |
154 | mov r2, r5 /* TTB pointer */ | 155 | * cached, buffered */ |
155 | add r3, r5, #64*4 /* End position */ | 156 | mov r2, r5 /* TTB pointer */ |
156 | orr r1, r1, #0x80000000 /* Physical address */ | 157 | add r3, r5, #64*4 /* End position */ |
157 | orr r1, r1, #((1 << 3) | /* cache flag */ \ | 158 | orr r1, r1, #(0x80000000 | /* Physical address */ \ |
158 | (1 << 2)) /* buffer flag */ | 159 | (1 << 3) | /* cache flag */ \ |
160 | (1 << 2)) /* buffer flag */ | ||
159 | 1: | 161 | 1: |
160 | str r1, [r2], #4 | 162 | str r1, [r2], #4 |
161 | add r1, r1, #(1 << 20) | 163 | add r1, r1, #(1 << 20) |
162 | cmp r2, r3 | 164 | cmp r2, r3 |
163 | blo 1b | 165 | blo 1b |
164 | 166 | ||
165 | /* Map device section 0x83f00000 to 0x03f00000 - buffered, not cached */ | 167 | /* Map TTB, FRAME and QHARRAY section PA:0x83f00000-0x83ffffff to |
166 | bic r1, r1, #0x0ff00000 | 168 | * VA:0x04000000-0x040fffff |
167 | orr r1, r1, #0x03f00000 | 169 | * not cache, buffered */ |
168 | bic r1, r1, #(1 << 3) | 170 | sub r1, r1, #0x00100000 |
169 | add r2, r5, #63*4 | 171 | bic r1, r1, #(1 << 3) /* clear cache flag */ |
170 | str r1, [r2] | 172 | str r1, [r5, #64*4] |
171 | 173 | ||
172 | /* Enable MMU */ | 174 | /* Enable MMU */ |
173 | mov r0, #0 | 175 | mov r0, #0 |
174 | mcr p15, 0, r0, c8, c7, 0 /* Invalidate TLB */ | 176 | mcr p15, 0, r0, c8, c7, 0 /* Invalidate TLB */ |
@@ -249,7 +251,7 @@ remap_end: | |||
249 | bl clean_dcache_range | 251 | bl clean_dcache_range |
250 | #endif /* BOOTLOADER */ | 252 | #endif /* BOOTLOADER */ |
251 | 253 | ||
252 | /* Initialise bss section to zero */ | 254 | /* Initialise bss and ncbss sections to zero */ |
253 | ldr r2, =_edata | 255 | ldr r2, =_edata |
254 | ldr r3, =_end | 256 | ldr r3, =_end |
255 | mov r4, #0 | 257 | mov r4, #0 |
@@ -257,15 +259,6 @@ remap_end: | |||
257 | cmp r3, r2 | 259 | cmp r3, r2 |
258 | strhi r4, [r2], #4 | 260 | strhi r4, [r2], #4 |
259 | bhi 1b | 261 | bhi 1b |
260 | |||
261 | /* Initialise the device bss section to zero */ | ||
262 | ldr r2, =_devbssdata | ||
263 | ldr r3, =_devbssend | ||
264 | mov r4, #0 | ||
265 | 1: | ||
266 | cmp r3, r2 | ||
267 | strhi r4, [r2], #4 | ||
268 | bhi 1b | ||
269 | 262 | ||
270 | /* Set up some stack and munge it with 0xdeadbeef */ | 263 | /* Set up some stack and munge it with 0xdeadbeef */ |
271 | ldr sp, =stackend | 264 | ldr sp, =stackend |